to be a killjoy. to ruin someone's happiness, whether they are drunk, or just really happy, with sad news or drama.
mellow, in a good mood, then someone tells you something saddening. u harshed the mellow.

"dude. your house is on fire."
"damn. you totally harsh my mellow."
by kiley hamre November 06, 2007
buzz kill
Don't harsh my mellow by asking me about my SAT scores.
by Travelgrlny August 17, 2012
1. To annoy someone and bring them down whilst they're in a good mood
2. To annoy someone and bring them down whilst they're high
1: "This guy's annoying the fuck outta me, he's totally harsh my mellow!"
2: "Like duuude, this guy just came along and was screaming at me and dude, whoa dude HE TOTALLY HARSH MY MELLOW man!"
by LordEuronymous May 27, 2012

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