Someone who prefers the submissive role of a bottom in a sexual relationship, but is willing to switch from a bottom to a top in certain sexual situations.
A gay/bi term that means a guy is comfortable being either the pitcher or the catcher during anal sex. Some versitile guys have a preference for one over the other, but will do whichever depending on their current partner. Others have no real preference between the two and alternate to keep their sex life more interesting.