Top Definition
When a heavily intoxicated girl or just plain-out whore decides to grind on 5 or more guys in a linear pattern, usually occuring at club, house party, or concert
Clemson, SC

Guy 1: "Dude I was at Flip-Flop's last night and this drunk-ass rallycat was all up on me and like 8 other guys."
Guy 2: "Oh, she's one of those line grinders."
by Coach Sam Copeland January 23, 2010
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