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!
© 1999-2015 Urban Dictionary ®
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