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1.
<interjection> Chiefly British;

1) Expression of victory or happiness of the result of a given situation.

Get in (there)
2) Phrase used to encourage another to do something dangerous or exciting, usually when they show signs of wanting to do it anyway.
1)
CARL: "Here, Pete! Jenny says she wants to give you a hand-job."
PETE: "Get in! Where is she?"

2)
JENNY: "You like that?"
PETE: "Oh yeah, harder bitch! HARDER!"
<enter Pete's friends>
PETE'S FRIEND: "Haha, whoa! Get in there, lad!"
PETE'S FRIEND 2: "Ogh, that's fucking sick..."
by Stuart Fletcher February 05, 2005
212 48
 
2.
when someone does, says, or expresses something extremely stupid, they are told to form their hand into a cup like shape and put it under their breast or titty. After that, they scoop their titty into the air.
P1: "Man, I got A 40% on the final!!!" P2: "GET IN!!!"
P1:"Who is Michael Jackson?" P2:"GET IN!!!"
P1:"My Kill-Death ratio was .2" P2:"GET IN! Right now!"
by Bulldog777 October 26, 2009
6 15