Having slept with a cougar. Analogous to a V-card, which is sleeping with a virgin.
"dude, i got my cougar skin after takin that old broad gome with me!"
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A cougar skin is a woman who is older than a cougar and unattractive and lecherous and acts creepy and tries to sleep with men far younger then herself. A cougar skin is thus labeled because she is past the age of being designated as a I MILF and now is labeled a MIWNLF: Mom I would not like to fuck. Also known in antiquity as a old hag.
"Jennifer Lopez soon ain't gonna be a cougar she gonna be a cougar skin pretty soon and now man will wanna fuck he"