blow by

The small amount of wet shit that ends up in male underwear after urinating, usually caused by farting or a relaxed anal sphincter.

Mom: "Goddamit it Sol, look at this blow by in your underwear!"
Son: "Oh fuck you, just do the laundry and shut up."
Mom: "I swear Sol, sometimes I don't think you're my son, or Jewish, or enrolled at Penn."
Son: "Suck my soulja boy, Mama."

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