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2.
A response to something of obviously little importance when it is exclaimed otherwise.
"Dude, my friends know the singer of Graf Orlock!"

"Big shit."

by C Squat January 21, 2009
 
1.
An arrogant person who thinks or acts like they are way more important than they really are.
Joe thinks he is a BIG SHIT now that he has a six figure income.
by MermaidGlenda September 15, 2009