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 4, 2009
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What comes next. A little innuendo about getting to the "best" part, moving past flirting and getting down to it, time to get it on.
I really like what you're doing here, yet, I think you're gonna have to work just a little bit harder baby.
Yes boss, let me do the b part, pllllleeeeaaase!
by globular46 August 18, 2011
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What a guy fast forwards to when he is watching porn and is about ready to blow his wad.
Oh man, get to the good part now! I'm ready to cum!
by Wiseman July 11, 2006
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A code phrase between males. "Part 3" can be anything sexual you want it to be. It can be making out with a girl, throwing a bone at a girl, or anything you want with a girl. It is usually sexual intercourse in which the reproductive parts are put into action. It is used by males around their girlfriends to trick them into agreeing for a "part 3". Then, you would brag to your guy friends by saying that you've had a "part 3."

This follows part 1 and part 2.
Brian: "Hey babe, you remember our part 3 last night?"
Jenna: "Huh? Sure."

Wesley: "Wanna part 3?"
Meghan: "Uhh... sure?"

Brian: "Dudes! We hella part 3'd!"
Wesley and Brian: "Ooooh shit! DAMN! PART 3! PART 3!"
by Brian Wesley Brian May 26, 2008
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A Polite Way for Rich Snobs to tell Poor People to get out of the way. Or just another way you can politely tell someone to GET OUT OF THE WAY.
Texas Kajillionannananaanre - “Part The Waves; I am superior of y’all.”
by Zxturn February 26, 2020
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It's when you start "talking" with a girl. It's the beginning of "part x.xx", which is similar to the "bases" for relationships. The closer you get with the girl, the higher the number. If you start going out with the girl, that turns into part 2. One night stands can be as high as part 1.99 since you're not actually going out with the girl.
Brian: I heard that "G" got up to part 1.99 with some guy. Wtheo!
Wes: Yeah. Dude, she's not going out with that guy, but they got pretty far.
Brian: I got to part 2 already. Even up to part 2.8, woohoo.
Brian: I haven't gotten to part 1 because of how long I've been in a relationship. Yee.
by Brian Wesley Brian November 15, 2010
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