a sound a person makes after he or she says something that they want to do or do to somebody.
Hey! Lets go to that party and get shit faced!& leave with some random guys! hmmmmm??! :) hahah
by badassical December 15, 2009
When someone says or does something shit...really shit, you must reply (very loudly) HMMMMM!
Randon Guy: Jim Morrison isn't that good...
by The Real BB October 12, 2007