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1.
That God awful haircut for guys in the early 1990's. Easily replacing the infamous Mullet as worst haircut of the decade. Hair grown to temples, parted down the middle and the rest of the head shaved creating a mushroom like appearance.
I can't believe we even crushed on guys back then when they all had mushroom cuts!
by jenash1008 January 07, 2011
 
2.
When a male swings his glan on the forehead of a female giving the effect of cutting her hair with your mushroom (dick).
"Dude, whys your dick out?"
"Shut up, I'm about to mushroom cut this freshman."
by mushroomcutter September 18, 2009