H.M.C. Stands for "Heavy Metal Club". It's a group/club with members who wear colors just like a motorcycle club, and have by-laws and a hierarchy. Most are local while the bigger, more recognized ones are international and have chapters throughout the world.
by Werewolf Von Bloodstörm December 14, 2011
by randymaurice July 08, 2010
by DrizzlemyNizzlefoshizzle December 27, 2017
Originating from random mathletes bored during the otherwise dull math meets which they attended, the phrase "HMC" is an abbreviation for "Hot Math Chick." Mathletes have been known to use the acronym sarcastically or more rarely seriously.
by Tang April 18, 2005