by Big_Bongo February 12, 2021

by The big okie October 24, 2019

Did you see that chick on the treadmill with the big mac ass?
Yea, I just want to go take a bite out of it!
Yea, I just want to go take a bite out of it!
by crackle1102 August 18, 2014

slang for '25', as in quarter pounder.
by Mark in the Dark April 15, 2006

The term means to replace the middle bun of a double stacked burger, specifically a McDonald's Big Mac, with a Boston Cream. The result is a mess of calories and delicious (not really at all) creamy, meaty goodness
by BedsideKush March 26, 2011

My brothers boss said he had more vacation then he really had, he felt guilty so he Big-Mac Up'ed and told his boss that he had already used his days.
by Bella Jones January 12, 2010

by thisishorrible September 18, 2012
