A stomach of a woman that has hundreds stretch marks, usually due to her being previously pregnant and/or fat, then losing weight, but keeping the stretch marks. Resembles the wrinkles in a person's brain. On her stomach.
Bob: "Why doesn't Jane ever wear a two-piece bathing suit?"
Johnny: "Because she has Brain Stomach."
Bob: "Oh."
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Hashtag abbreviation of "Fuck You, Mr. President."
"#FUMP is trending. What does that stand for? "
"Fuck You, Mr. President."
"Say no more, fam."
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