Owning up to something when you know, and the people all around you know that you are guilty.
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 11, 2010
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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
Yo guy, let's hit up McDonalds and Tim Hortons and make ourselves some Boston Big Macs
by BedsideKush March 10, 2011
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A swasiland hamburger is the latest entry into the long chain of sickening sexual acts (eg: Arabian Goggles, Danish Teabag) It consists of freeze drying a shit and popping it inside a presented hole. Its origin is unknown, no on knows why we pinned this one on swasilanders, but it rolls off the tongue nicely!
"I slapped my Swasiland Big Mac between her buns"
by Bladecatcher January 07, 2007
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A phact and/or phacts that are so dummy thicc that they are not only known to be true, but are far more dope than regular boring facts
“It is time to rip a fatty dab you chode mongers”

“Big Mac phatty phacts my dood
by Bigdikdood January 26, 2020
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When a woman shits out her pussy, usually when she squeezes too hard in an attempt to queef, after shes eatin a bean borrito from taco bell
"She let out the Big Mac Attack on me while i was fuckin her.... dont trust her."
by Andy K April 18, 2004
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The consuming of a Big Mac from McDonald's, and shitting it out in a diarrhea-ish manner later on that day, or the first thing next morning.
Ketchup: (yelling into the bathroom) Hey Beef whats taking so long?

Beef: Oh I just had a Big Mac man!

Ketchup: And?

Beef: Its coming out of my ass right now, and I only had it a while ago! I'm having (yet another) Big Mac Shit Attack!

Ketchup: Ouch. I feel bad for the toilet after this one.

Beef: Yeah, me too.
by RogueMan7 December 17, 2007
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