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1.
A phrase which describes one's feelings of pure desire and/or support when paired with a given subject.

Conversely, "Get Out Of My Mouth" describes a general feeling of disdain and disapproval.
"Oh my god. Lady Gaga and Madonna, GET IN MY MOUTH. Then mix in my stomach to create beautiful music that I may dance to"

"In n Out Burger!? GET IN MY MOUTH"

"Ew, Sean Connery? GET OUT OF MY MOUTH".
by omgGIMM August 09, 2010
 
2.
A common phrase used to tell someone to get into your mouth.
Guy1: Get in my mouth
Guy2: I'm not sure i will fit.
by Josh Y439094894 October 15, 2008