1. A slang term telling someone good-bye, used with a hand gesture in which you pound your chest with your fist twice, then give the peace sign.

A person with an outwardly dominant, masculine, or aggressive personality, but who also enthusiastically takes on the submissive or "bottom" role in the bedroom.

A wannabee hippie saying good bye.

depending on the context:
1) c ya later
2) fuck off

1. Goodbye
2. (intransitive verb) to leave or retire
3. (transitive verb) to kill

Note: I only heard the third meaning recently, but I thought it was pretty funny so I've included it.

A very informal goodbye greeting; 'see you later'. Sometimes used in an ironic fashion for goodbyes that should be more serious, i.e. the recipient dying, being killed, defeated, or left behind.

A common misspelling of "peace out." People who are too lazy to hit the space bar use it. Everyone who uses "peaceout" should just peace out.