Top Definition
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."
#killjoy #trip #wack #suck #lame
by kiley hamre November 06, 2007
buzz kill
Don't harsh my mellow by asking me about my SAT scores.
#buzz kill #drag #downer #debbie-downer #wet blanket
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!"
#harshed #my #mellow #your #the
by LordEuronymous May 27, 2012
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