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Marijuana, pot, bud; often used as Boo for short and in many times with anger.
1)Yo! Gimm' some dat 'Boo Boo Shmack' neoew!!
2)(or in a formal context) Excuse me kind sir, but do you happen to have any 'Boo'?
by Alex O'B May 22, 2008
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Jun 24 Word of the Day
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.

Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'

Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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3
Slang for really, really, really, SUPER potent weed. Usually shortened to boo for ambiguity. Supposedly coined by this guy named Pimp Dog who did this amazing free-style at this party i was at.
1) "You gadat boo?"
2) "Hey bro, i burned some Boo Boo Shmack yesterday, went fuckin' blind.. turns out, my eyelid muscle permanently broke. Too much THC homie, eyes cracked for life."
by iball45 October 10, 2010
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4
Weed Marijuana. The term Boo Boo Shmack can be broken down into the three words that make it. Boo, Boo Boo, or just Shmack. The "Sh" must really be pronunciation as to not be confused with smack (an unrelated term)
1) Yo mang pass that boo.
2)Ready to Shmack out?
3)Boo boo time ma'fka!
4)Holy cow mang, this is some extremely potent Boo Boo Shmack
by yellowGZ November 18, 2009
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