When someone is away from their boyfriend/girlfriend for a period of time that results in them becoming lonelyhorny and desperate. As a result they throw themselves at the first person of the opposite sex who shows interest in them.
Samara: Ew, did you see Shayleen ! She was gone from Joe for two weeks and she became a total horne master !
Sally: I totally noticed she was all over Kent, hes not even hot!