A psychological term. When a participant is in an experiment you may not get accurate results because they are aware of the experiment and in turn go out of their way to do everything wrong or go against everything u ask them to.
the sexual act of a having a woman spinning while riding a man penis in the fashion of a screw driver screwing in a screw but it can be reverse to have the man spinning while in the woman
(Slang): A censored, rhyming way of essentially asking "who the fuck", also can be done as "what the screw", "Where the screw, ect, but doesn't sound nearly as good.
Child 1: *Throws pencil at Child 2*
Child 2: Who the f-....
Teacher: *ahem*
Child 2: Sorry. Who the screw thew that?!
Child 3: *points at Child 1* it was him!
Child 1: Snitch!