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1 definition by Glutius Maximus

 
1.
A descriptive adjective to be used if one's appearance or actions either resemble or call to mind the crevice between the cheeks of the ass.
Her smile looked like a buttcrack on it's side. OR... You are being such a buttcrack right now because you won't go out with me.
by Glutius Maximus April 18, 2005