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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.
Skinass by Jelly Elly October 21, 2012
Related Words
The opposite of a fatass. Can be used in an insult
Look at that skinass over there, he needs to gain some wright.”
SkinAss by TOOLIESLEAN December 23, 2024

SkinnyAss 

SkinAss, or SkinnyAss is the opposite of an fatass, is used as a insult for skinny people
“Hey look at that skinnyass over there he needs to lose some weight.”
SkinnyAss by TOOLIESLEAN December 23, 2024