I'm not ashamed of my job - I do research as a PhD fellow in a scientific field. Dammit, though - I am sick of explaining it over and over again every fifteen minutes. I'd like a way to deflect this topic entirely until I have a chance to explain it one-on-one at a later time. Conversation always drags when I have to explain things and girls seem to lose interest. I'd rather just talk about more interesting things.

Any suggestions?

EDIT: Oh wow, this got some attention after I walked away from the computer. Thanks for all the suggestions! I love discussions like this.