Undercover Brother

A nerdy man who has a timid demeanor and undeveloped physique, (especially a white or Asian man), but an enormous penis.

"Lola said Ling and Bradley are straight-up Undercover Brothers!"

by Mortimer L. Bard August 16, 2007

Undercover Elephant

Otherwise ordinary looking fellow, who possesses a trouser snake of Ron Jeremy-like proportions.

"What's with the guy you were with last night, he seemed so dull?"
"On the outside, sure, but he's a real undercover elephant"

by BobTrollop May 27, 2007

Undercover Slurry

Someone who looks and acts completely innocent but when near alcohol:
Gets incredibly drunk
Dances innapropriately aka : skanking
Hooks up with randoms

Crissy: jeez ur such a undercover slurry
Jay: i cant remember last night
Crissy: its always the quiet ones.

by ScarletPartyxx October 17, 2008

undercover time machine

Really poor sex act that seems like it goes on forever, but secretly it's only about 30 seconds or so...

Unfortunately, despite my hopes, he was an Undercover Time Machine in bed...

by BK516 October 5, 2017

active undercarriage rust protection

Marketing-speak for a chronic oil leak on your automobile - generally one that takes more effort to fix than the car is worth. Comes standard on most General Motors products since the early 60s, as well as Saab 900 series.

Click: Dude have you seen that grease spot on your inner fender?
Clack: Oh don't worry about it, that's just active undercarriage rust protection. Paid extra for it. I think.

by Buick Roadmaster June 5, 2011

undercarriage

Very simple. This is your pet's fucking stomach.

Kitty loves it when you scratch her undercarriage.

by Shagmelon April 16, 2011

UNDERAGE USER!

U suck like a 12 yr old girl^^

"UNDERAGE USER!"

by fucker August 21, 2003