The word take down, or TD, is used to describe a male or female meeting a member of the opposite sex (or same sex, I suppose) at a bar, restaurant, social gathering, super market, gym, etc., and physically leaving with that person and either making out extensively or having sex. There are different levels of take downs. A full take down, or full TD, is sex. A partial take down may just be oral sex or extensive making out. It is important to classify your TD. TD in itself just means a hook up. A full TD means much more.
Bob: Jimbo went to the Publick House bar last night, met a young coed, left with her, and had an extensive take down.
George: Was it a full TD?
Bob: I don't think so, just extensive.
George: Man, that Jimbo.
Larry went to Pavlov's bar last night and had a full TD on an empty keg in the stock room.