What does "outta" mean? When do you use this phrase?

Native speaker’s answer
Rebecca
The phrase "outta" is an informal, nonstandard contraction of “out of". When you see it written like this it used to represent colloquial speech. Here it means "let's get out of here", meaning let's leave. Ex: We'd better get outta here, man! Ex: I'm outta here (I'm leaving).