Top definition
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
Get the mug
Get a Mr. Bigshit mug for your cousin James.