1. interjection An exclamation of surprise, disbelief, and/or incredulity. (Colloquial contraction of "get out of here.") Sally's brother is dating my cousin? Get outta here! You just won the lottery? Get outta here!

2. verb To leave or depart from a specific place. Also used as a command to do so. (Colloquial contraction of "get out of here.") I think we'd better get outta here, things are starting to look a little bit rough. Get outta here, you hooligans!