The area between your legs. Your crotch.
Damn Betty, go shower, you've got one janky undercarriage.
by T dawg March 23, 2005
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Very simple. This is your pet's fucking stomach.
Kitty loves it when you scratch her undercarriage.
by Shagmelon March 30, 2011
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If you are a little pudgy, your gut may sag down when doing push ups or copulating. This can be particularly unattractive as during vigorous sex, it may swing from side to side, back and forth, much like a metronome. In extreme cases, the folds of fat, or female breasts, may slap together making a sound not dissimilar to the sound of a sealion performing for food at shows at many zoos. This noise is known as flap or tat slapping.
"Dude, I was fucking Cindy in the ass"
"Awesome dude! How was it?"
"Great, but her undercarriage was swinging around, almost knocked me off balance"
"Eww. Sick dude"
by jizzmong hunter August 22, 2009
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Someone who doesn't like to wipe after a fat shit.
"I heard he has a rusty undercarriage."
by Onethatpeoplehaventusedyet August 2, 2014
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The act of licking/sucking the gooch.An act typically completed during a Blow Job.
Damn! That ho worked hard, she even gave me an Undercarriage Polish
by Mr.Chin April 27, 2011
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A testament to ones cunnilingus skills. A shashbuckler of a females nether regions. A pirate of poonani...
Broads be calling us the Sailors of the South Mouth, a regular Brigadier General of the clit ...shit them hoes over there know me as Capt VanGyner the saltiest of all them Undercarriage Marauders.
by Frydae November 10, 2011
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To wash, clean, tidy and if necessary, shave and trim, one’s genitals, taint or asshole. All three if circumstances warrant.
The prostitute dashed into the Wawa bathroom to do an undercarriage makeover after her last John filled her like a Boston cream donut.

The humidity was so swamp ass inducing that I had to freshen with an undercarriage makeover.

I gave myself and entire undercarriage makeover before my Grindr hook up arrived.

I looked like Chewbacca’s face down there so I cleaned up with an undercarriage makeover.
by Dick Onchin November 14, 2020
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