The guy who doesn't work at the company, yet seems to always be on the winning team of the company golf outings.

a ringtone some people buy

That guy who says he wants to hang out but declines every time he is asked

When a black person is attracted sexually to a white woman.

Hard and rough anal sex leaving the receiving party’s asshole vibrating

This is a euphamism for having a bowel movement.

Loosely based on definitions where cheating or subterfuge are involved, the word ringer can also be used colloquially or jokingly to indicate a shark that simply seeks out easy prey in any competitive sport or game.