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The stuff you wear under your pants, like your butt, your junk, and the place you wipe. It’s also what happens when a robot splits in half and the bottom half is called the B-part because it’s the part that gets wrecked the most.
Bro, I’d rather get hit by a truck than let you see my B-parts.
That robot looked like it got ran over by a bus, total B-part disaster.
I told my mom I was going to the store, but I was really just running from my B-parts being exposed.