To take an innocent comment and inject sexual meaning into it. Usually the maker of the innocent comment has left themselves wide open - but with so many words and phrases that lead a dark double life as euphamisms for sexy stuff, it's all but impossible to guard your communications from being warped.

Warpers are usually quite juvenile and taken to snickering over just about anything vaugely titillating ("you said jugs. heh heh. heh. heh.").