1.A term used for the Drug Crystal Meth Amphetamine
2A some what derogatory name for person under the influence of crystal meth.
1. "They just smoked a fat bowl of gack
or Thats some killer Gack!"
2. "That guy is a total effin gack." or "Quit being such a gack, your going to get us busted!" or "Never bring that gack over to my house again!"
© 1999-2015 Urban Dictionary ®
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