an ex or previous sexual partner. someone whom you had some form of relations with in the past.
Jackie: " girl you won't believe what i did last night! "
Mellissa: " it wasnt crack right?!?!?! "
Jackie: " no i don' messed around and had sex with my throwback. "
A reject. When someone is an overall waste of time/space. Referring to ice fishing, when you catch a fish that is not of a suitable size, you throw it back in.
When a couple of douches with ed hardy shirts and mowhawks walk by: