What is a full body erection? A full body erection is when all your muscles are looking full, and not flat, giving you the appearance of looking more shapely, larger and more aesthetically pleasing. The state of post workout pump.

Basic understanding

Your muscle cells are a series of thread like cells that can have contractile force, inside the cell is a fluid called the sarcoplasm (in every other cell it's called the cytoplasm.) The amount of sarcoplasm stored is able to give it a 'fuller' more dense type of look. Sarcoplasm is able to retain unusually large amounts of glycogen (polymer of glucose), water and salts.

Nutrition:

Get enough carbs, seriously - I know you're scared of being fat but if you want to maintain an FBE, your muscles need to be saturated with glycogen.

Eat complex carbs; oats, pasta, breads, potatoes. Starch it UP.

If you are trying to lose weight, then time your carbs in a way that it is mostly within 12-18 hours before your most intense workouts.

This gives your digestive system enough time to load up your muscles with glycogen that would be mostly spent during said 'intense workout.'

Drink water. I mean, lots of water.

Consume salt, yeah I know it's bad to overdo the sodium. I don't recommend just wildin out on potato chips and consuming the good old classic table SALT. I really recommend Oral Rehydration Salts, or a mix of salts/electrolytes. Fortunately there are lots of products that do just this, mostly marketed for runners - nuun hydration, gu, any electrolyte mix works, just make sure it isn't loaded with sugar (no gatorade), just good old salt does wonders too.

If you are on a cut, I will also suggest taking BCAAs, cause you don't wanna risk having an incomplete amino acid profile (more on this later)

On protein, make sure you get enough and from a variety of sources.
Supplement with Creatine. It makes your muscles draw in more water, making you look dense and fuller.

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Stimulants:

Generally I can say that most commercially available preworkout powders (Cellucor C4, Optimum Pre, Dymatize Pre, etc.) are okay to use and will give favorable results for a pump. This may be somewhat acute as the research suggests. The active ingredients are mostly Agmatine Sulfate and L-Citrulline Malate. They help you look fuller by increasing the nitric oxide content in your body.

Nitric Oxide is a vasodilator that helps relax the blood vessels, allowing them to deliver more blood to your muscles, which results in more oxygen, glycogen and salt for your muscles to replenish with. The individual mechanisms of each compound differs; generally speaking Nitric Oxide is synthesised in the body by the enzyme Nitric Oxide synthase mostly at the endothelium (inner layer of blood vessels) where it then diffuses into your muscles.

Nitric Oxide is synthesised using the amino acid L-Arginine. I'm of the opinion that if you are able to eat a balanced diet with sufficient protein with a full amino acid profile, you should not be seeing much of a difference.

Another very controversial suggestion is to supplement with Sildenafil Citrate (Viagra) or Taladafil (Cialis), as they increase blood flow. However the clinical dosages recommended for patients with erectile dysfunction range from 25mg to 100mg of Sildenafil Citrate. I think this is far too high and has way too many side effects for young healthy male adults, I would only recommend 5 - 10mg, for a maximum of 2x a week before a workout to achieve a pump. However the effects would only last 2-4hrs. Perfect for a night out.

Training:

I will not go indepth to the training aspect, as if you're reading this I will assume you already have a workout routine, or a way you like to train. But I want to touch on some science behind the 'pump' or sarcoplasmic hypertrophy.

Your muscles can function in two states, anaerobic and aerobic. The best way to differentiate is the build up of lactic acid in your muscles, the burning sensation as you exercise - being mostly anaerobic. It's not a switch between the two, it's a dial.

Do not neglect the anaerobic part of your workouts as the lactic acid build up has been proven to increase the sarcoplasm in your muscle cells - known as sarcoplasmic hypertrophy. Until it is limited by the number of myofibril (the amount of cells). Maximal effort generally stimulates more myofibrillar hypertrophy (the creation of new muscle cells) but is more neurologically taxing.

Stay hard, boys. ;)

PS: Feel free to leave any tips or tricks for me, and I'll edit them in.