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The body below the waist, in particular the genitals, buttocks, and anus.

From Gundam where in some of the series when the mecha breaks in half, the two halves are called the "A parts" and the "B parts".
"Holy shit, dude, cover your b-parts with a towel or something! My girlfriend is in the house!"
by Dr. Buttz May 04, 2009

Words related to b-parts

gundam anatomy ass body genitals nudity privates