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1 definition by Leah McCar

 
1.
A slang term that mean to masturbate a man with a small penis-- hence "grippin" means to masturbate, and "grain" refers to the smallness of a cock.
Sally: Hey Nina, I heard you got a new boyfriend.
Nina: Yeah. His name is Arnold Shwarzenegger.
Sally: Ohhh, you like grippin grain, aye?
by Leah McCar April 19, 2008