This term is used for insulting someone fat,overwhieght, huge,etc. this is because the Big Mac is a very big and fattening burger from Mc'Donalds. You can also use the term Mc'double.
(In a classroom with a fat teacher) student1"the Big Mac is comeing" student2 " everyone do your work!!" Fat teacher " I'm back now do your damn work!!"
by BILLYGOAT May 14, 2015
A burger that over the years gets smaller and smaller

Back in 1990 i remember this thing being bloody huge, now days its the size of a tennis ball.
What ever happened to the fucking "big mac"?
by chemical mcfeast October 18, 2005
The burger of dreams. OR heart attacks, whichever comes first.
I got a big mac and now I'm in heaven! literaly!
by Zach G. January 15, 2004
Two all beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun.
big macs are gooooooood
by lolay January 11, 2004
Codename for a fat person. Usually used to notify a buddy that there is an obese person within the premises.
Dude check it out, big mac, 4 o'clock!
by HuFlungPu August 30, 2008
To fart on someone and sit on their face
Oh I just Big Macd this guy named Tyrone yesterday, he sucked my willy and shat on my chest, I love Big Maccing people
by Willy03 February 12, 2022