look up any word, like cleveland steamer:
 
1.
1) an otherwise average idiot, once given authority to be in charge, acts as if he is the shit. 2)acting like a jackass on someone else's money.
"Better get to work, here comes Mr. Bigshit."
"Look at Mr. Bigshit, charging all that shit on the company credit card."
by pussyliquor December 11, 2007