An online berating (similar to a real world bitchslap), conducted over gchat or AIM, that is intended to knock some sense into someone.
e34: I may be late for practice tonight
e34: that fly honey asked me to coffee
toobutz: DUDE, seriously? You're due for a major chatslap...forget about that ho and get your ass there on time.
e34: daym. f.i.n.e.