1 definition by No irgindwo

Top Definition
Stands for "harshing my mellow." Something to be used when you are annoyed, or your normally green aura has been turned red.
John: You need to be more responsible! What is wrong with you, don't you have any sense of trustworthiness?
Jeff: Chill out, man. You're HMM.
John: What? Filthy hippie!
Jeff: :P
by No irgindwo May 13, 2012
Mug icon
Buy a HMM mug!