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The tanning of the underside of the nose, as usually achieved through artificial means such as a spray from a tanning salon. An up tan implies that one would have to be upside down in the sun in order to tan that part of the body, and is therefore a giveaway that the tan is artificial.
She must have gone to a salon, check out her up tan.
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Free to do whatever , have fun , get lit , get active
I’m bout to go Tan Up , Summer bout to be Tan Up , Shawty Let’s Tan Up
Tan Up by anonymous April 2, 2022
When a drunk asshole takes a shit in the tank of your toilet rather than the bowl,as a joke.
I got drunk and up tanked at some fags house, he was pissed. Word bitch.
up tank by Lester Diamond December 20, 2009

Fill Up Your Tank 

To pregame or drink before you begin your night out on the town. To consume alcoholic drinks at one's home, perhaps due to: a rough economy with hard times, being an underage child without a fake ID, or in most cases, insurance for good times.
Me: "We're going to a speed dating event tonight???"
John: "Yep at 10pm"
Me: "Wanna come over and fill up your tank at 8?! I'm gonna need it!"

Filling Up The Tank 

Peeing in a girls butt during anal.
Dude me nd my girl are filling up the tank tonight @ the wedding reception

Filling up the tank 

When a guy sticks his penis into a girls ass and pisses
I was Filling up the tank with my girlfriend
Yo Tom what the fuck

tanked up 

Getting drunk as hell
Did you see Duffy last night at the party, man he was tanked up
tanked up by J.D May 27, 2005