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1.
Just Before getting Head you coat your cock with vapor rub and just before her mouth is on you you put her in a full nelson.
My wife complained about being all stuffy, so I got her in the mood and gave her the sinus buster.
by pjs5671 July 11, 2010
 
2.
slang for cocaine
All my money went on whores and sinus buster.
by THEEO.G.pimpalicious September 19, 2011