Ringbreaker 

When someone new breaks his way into a new group of friends due to change of circumstance. This can often cause confusion in the group with a change in the ranking of the alpha males or smaller characters in the group becoming left out and replaced.

Ben: I think Fister is coming over saturday night as well.
Karl: Fister?
Ben: you know Alex.
Karl: That bloody ringbreaker! who does he think he is! breaking into the gang and acting as if nothing has happened!!
Ben: Shut up karl.

Ringbreaker by klasalben November 24, 2011

ringbearer 

a girl who wears a purity ring. purity rings are vows to not have pre-maridal sex.

a: damn she's hot. i hope i get sex tonight.
b: bet you 5 bucks you won't.
a: why not?
b: she's a ringbearer, look at her left hand.

ringbearer by from January 3, 2007