Sheezer Share definition Flag A term when a man opens up the girls mouth and sneezes in it after anal sex. Damn I gave that girl a Sheezer. He aint gonna give me no sheezer. I'll sheeze all up in that bitch. Sheezer by J.L.F.G. January 4, 2008 0 0 Get merch Get the Sheezer mug. Buy Now — $32.95 See more merch