hang up 

something said constantly between two "in love" teenagers at the end of a phone call

To refuse to speak to some one.
To be silent while some one is talking to you

to kill yourself;to commit suicide

A hang up is a person who acts retarded, but isn't. They're almost retarded but they're just not quite there. They're on the edge.

To Retire, settle down.
It's based on the idea of an old gun slinger who finds true love and 'hangs up his guns' to become a farmer.

In modern usage, it could be said about a guy who has previously had lots of casual relationships, or considers himself a 'playa'

An annoyed or embarrassed response to the stupidity or incompetence of another. Synonymous with "Shut the fuck up", or "Jesus, you're stupid". Derived from one man's inability to counteract the obliviousness of those around him, to which he blurted it out in frustration. Also, an appropriate reply to an unfunny or otherwise retarded joke.