GMC 

Gobble My Cock

hey olivia, come over here and gmc (whips out dick and she starts sucking)

GMC by cocksucker69696969669 May 29, 2018

GMC 

Gargle My Cum

Can be used like smd

bitchy chick: hey asshole.
chill dude: gmc bitch!!!

GMC by urbandictmehhh November 22, 2011

GMC 

Gotta Mechanic Coming?

GMC by Mark Potter July 17, 2003

GMC 

Ginger Mega Chode; probably a kid named Pooch.

Hey did u hear of GMC?
Yes, it’s to fat

GMC by Quincy Mega Fuck November 11, 2019

GMC 

Garage Man's Companion

Gotta Mechanic Coming

Dude 1: "Whoa, what's with the junker GMC?" Dude 2: "It's my skanky ex wife's stupid useless vehicle. All she ever does is yap about her garage man's companion." Dude 1: "That sucks, man. I thought GMC meant Gotta Mechanic Coming."Dude 2: "That's what my slutbag ex wife said in our bedroom fucking that pindick mechanic!"

GMC by sliptrip December 17, 2011

GMC 

Genetically modified cowboys. An invasive species bent on destroying russia...

Friend: Did you see those GMC's going east.
You: must be heading to russia
Friend: why?
You: to invade...

GMC by XX_Doge420_XX December 12, 2019

GMC 

Government
Motors
Company

Person 1: Hey man do you prefer GMC or Ford?
Person 2: Well GMC was nicer until Obama hyjacked it...

GMC by echo2654 September 9, 2009