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2.
When a chick sits on your lap, crushing your nuts, while you roll 6 deep in a buick for an hour smoking pot.
Last night, Liz was sack riding bad.
by Johnald November 15, 2005
 
1.
When you suck up to another person, for beneficial reasons.
Did you see Steve sack riding the boss?
by chlopez December 26, 2007