An inexplicable, noticeable, callous on any little toe on one's foot which can only seem to be explained by one doing ninja like acts.
You sit and rest one foot on the table. Roommate notices an ugly yellow scab looking thing on the middle toe of your foot.

(Roommate): "Dude! How did you get that callous!?"
(You): "Wtf!? I don't know! It seems like some kind of ninja callous!"

Knowing that you weren't up to any ninja-like activities, you decide to pick at it, then realize its a piece of dead leaf.
by Koo guy March 27, 2012
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A man who has a rough shaft or foreskin from overuse rubbing from constant fornication in the past.
Jenny says she always needs lubrication because her boyfriend has a callous Cock.
by Jackrabbitslim69 March 22, 2022
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The buildup of the lining of the throat from repeated deep throating resulting in the thickening and desensations of the throat enabling no holes barred cock gobbling
Babs sure must have cock callouses
by Mattchew December 8, 2017
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An enlarged mid section also known as lower abdominals that are engorged due to repeated sexual encounters that lead to a false sense of comfort with a porky pig belly.
I’ve been married for 7 years so I am comfortable with my sexual callous.
by Cinnaright February 3, 2022
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A gal who looks like she should be a dainty palm but is way too independent for her own good. Usually a lesbian.
"That girl is so hot, man!"

"Don't even, dude, she is such a hairy callous."
by 'dork October 10, 2006
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When mom jeans/shorts have rubbed camel toe repeatedly and callous form on the beef curtains.
Gina had nasty camel callous from the high waist pants so I wasn’t gettin any tonight.
by 1beerlord September 16, 2018
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