To put your penis in the anus of an unsuspecting female partner. This trick works best while the female is on top. While she is riding you, grab the base of your shaft with one hand and thrust it in and out of her vagina quickly, then quickly, on the next inward thrust, aim it right for her browneye, and voila!
Dude I was railin' Julie last night, and I gave her the old slip trick.
An individual whos computer skills and knowledge of science fiction shows are bolsterd by his lack of sexual prowess and dress sense. They are generally picked on by everyone with a social standing.
Hampered by acne, a breaking voice, glasses so thick they can see through time and less muscle tome than a McChicken nugget the nerd is very rarely seen with a bird or any member of the female persuasion besides their mother.
Will hate jocks and other popular people, resenting them for thier social achievement and the fact that some can be intelligent with out having thier waistband above thier nipples.
"Oh christ, those damn nerds are playing dungeons and dragons in the library again."
"No, I don't want to go to Star Trek convention, it's full of nerds."