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The process of removing the collection of hair (usually long hair) that gathers in one's asscrack while in the shower. The collection occurs from washing/conditioning one's hair. The removal is typically done after soaping and directly before one steps out of the shower.
Heather was in the shower with her boyfriend Tighe for the first time when she noticed some suspicious activity occuring with his hands behind his back.

heather: are you shower flossing???

tighe: (turns red) ...yea...
by Oliver Klouzoff April 06, 2010
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