tucked like underarmor 

To conceal carry a firearm at all times.

Friend: bro, I’m nervous what happens if somebody tries to rob us?

Friend: don’t worry, I got that heater tucked like underarmor.

tucked like underarmor by AlwaysTucked July 31, 2021

Tucked Like Underarmor 

To conceal a firearm in ones waistband so snug that it resembles the tight fit of Underarmor.

Dylan: Hey man I'm kinda nervous we might get robbed...
Doug: Don't sweat it bro, I got that thang tucked like Underarmor.

Tucked Like Underarmor by AlwaysTucked August 25, 2021

Underarm her

The sexual act of putting one's penis inside the underarm of their partner.

My girlfriend allowed me to underarm her on my birthday.

Underarm her by Commando Matrix August 11, 2010

Undergarment Overflow 

When large amounts of ones underwear is visibly sticking out of their pants.

Girl: I see your boxers...something I shouldn't see
Guy: Sorry, that was undergarment overflow

Undergarment Overflow by larlarlarlarlar June 20, 2011

Underarm 

The soft pocket of skin beneath the shoulder that joins the inner part of the arm to the body.

The pretty girl's underarms were soft and smooth, hairless and extremely ticklish to the touch.

Underarm by Max March 16, 2004

Cups under arms

High level sweating in video games

He was being so cups under arms at civ last night

Cups under arms by Har j July 7, 2019

underass

Refers to the very short skirts that girls wear, which shows the lower section of their buttocks.

Dude, look at that girls underass! I'm sure I can see gash.

underass by hamstar... March 28, 2010