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1.
Not to be confused with roommate, a shroommate is one who you share your shrooms and trip balls with. Often times college students are in fact shroommates with their roommate.
Student: You study for the exam today Jeff?
Jeff: Nah man I just did shrooms with my shroommate, we were gonna get some munchies at the vending machine but a pregnant latina unicorn was there so we bailed.
by uzi does it April 09, 2010
 
2.
those two guys (or gals) who live together and do drugs together all the time.
I've become sensitized to interesting smells since moving in next-door to the shroommates.
by thisgirl10 December 22, 2009
 
3.
The transcendental effects of psilocybin mushrooms can improve interpersonal relationships between users.

A shroommate is a person with whom you now have an honest, clear, warm or spiritual relationship, solely because you took magic mushrooms together and experienced the mystical effects together.
Dan: You guys invited Larry yesterday?? Wasn't he awkward?

George: No, man... He was at first, but then we all took shrooms and had a great time. Larry and I talked for hours. We're total shroommates now.
by meowfulcopter June 17, 2011