Top Definition
1.) The dead skin yielded under your fingernails after scratching your buttocks.

2.) To scratch your posterior.

To skinass too hard or too often would be ill-advised, as you may end up developing poop finger.
Shaun headed to the nearest restroom after noticing he had a case of skinass on his hands.

Jordan always skinasses right when he gets out of bed in the morning. He may be developing a rash.
by Jelly Elly May 12, 2012

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