MC 

a "mad-cunt"
name used to describe someone who has done something fucking sick and deserves congratulation.
opposite to a GC (gay-cunt)

"man i cant believe he skulled that beer so fast, what a MC, lets go bash GC's"

MC by ruthies.a.mc April 18, 2007

mc 

1.A prefix to almost any term.
Used in comical situations to describe almost everything.
2.Sarcastic mockage of Mc Doanld's operators. Used whilst ordering at Mc Donalds.

1. Mc-Dave went to mc-get me some mc-donalds.

2."Hi welcome to Mc Donalds how may I take your order?"
"I'd mc-like to mc-order a mc-chicken mc-cheese mc-burger. Hold the mc-cheese. Hang on i need to mc-go to the mc-toilet. Mc-scuse me...mc mc mc mc mc mc..."

mc by James Mc-Graham June 29, 2005

MC 

By far the coolest and, more importantly, most caring teacher in the history of the universe. Her student-advocate award next to her bookshelf says it all. One might say she may even be “too caring”. However, those people are obviously stupid. MC is the type of teacher you can talk to when your grade isn’t looking too good and the type of teacher you can talk to when your life isn’t looking too good. MC is the type of teacher that literally always has your back, even when you crush cheez-itz in her clean chrome books. MC is the type of teacher you can call your friend without looking like a complete frickin loser. MC is the type of teacher to act like she gets irritated then get called out for faking it. MC is the type of teacher that is hands down, truly the best teacher in the history of the world.

Joshua- “Hey Kevin. Is Emily still being a complete asshole?”

Kevin- “Yeah. It’s okay though cuz MC has my back on this.”

MC by liebensteinowitzberg April 29, 2019

MC 

In the UK, it means a person who performs at a dance club, usually yelling into a microphone to techno music. It's like rap, only incomprehensible.

An example of an Mc rap, "Bidda bidda bad boy on the mic, jsdfhusdfuhuisdfhuih"

MC by Glad to be in the usa August 10, 2007

MC 

short for Master Cheif off of Halo

"MC would so kick the Covenant's ass!"

MC by Dirge January 30, 2005

MC 

A Missed Connection, usually a romantic glance or conversation without any ability to later reconnect. Popularized on Craigslist's "Missed Connections" personals.

"Why can't I ever have an MC?"

MC by Ped Xing August 16, 2006

MC 

MC is short for Monster Cock. Aka, a monstrously huge penis.

"Dude, why is that girl limping so badly?"
"She probably took an MC last night"

MC by Tedddd December 24, 2008