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1.
The act of masturbating while sitting in a booster seat. You must also be completely naked. The booster seat may be that of an automobile or of a table.
I was in my car earlier, boosting off.
by Daniel Soochan November 15, 2006
 
2.
The act of masturbating while completely naked and while sitting on a child's booster seat, be it for an automobile or for a table.
Daniel was sitting in the back of his car boosting off.
by Johannus Zalobanskus November 12, 2006