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1.
when you're peacefully blazed and something happens to ruin your high..
"Dude got baked and was screaming and shit. He completely harshed my mellow man."
by PsychoDice January 13, 2004
 
2.
The act of having somebody bring down your mellow/Good feeling thus making you feel negative/harshed.
Dude, I won the lottery and then all the banks closed. This is really harshed my mellow bro.
by Unorthodox Identity October 10, 2009
 
3.
When your positive and well-being is put down or disturbed.
"Your fired"said Bill.
"Wow, that harshed my mellow."said Tom.
by quezzy baby & shayla brezzy April 30, 2009
 
4.
An action, state or other event that annoys or otherwise bugs a person.
Spilled coffee all over myself this morning, really harshed my mellow.
by Lucello May 12, 2010