When you jerk off a black guy and he ejaculates, and you have to pick out semen from underneath your fingernails.
"I was picking cotton after a fun night with Bill Cosby"
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When two men who are engaging in sexual activities create enough friction by rubbing their penises together to the point of which they have rubbed off skin on each other.
"Bro, I just got done trading skin with Betty White in the bath 10 minutes ago."
In the act of a blowjob. The giving partner suddenly bites the shaft and yanks down, ripping off the skin of the penis and essentially turning it inside out.
"Bro, my girl Shanesha gave me an erectile inversion."