Under Arm Pussy 

The space between the side of your arm that connects to the torso -- especially with a weight lifting guy. It forms a unique pouch area.

Under Arm Pussy (UAP)

Under Arm Pussy by Josie12726 September 17, 2010

under arm kush 

A kind of kush Gucci talks about. Apparently it smells musty?

Under arm kush and you know it smells musty. Sold a couple grams just to buy some red monkeys(X Pills)

under arm kush by Bisexual Horse March 25, 2009

under the arm 

Liverpool slang from the 1960s, possibly earlier, meaning 'bad or terrible'.

"What did you think of that book I lent you?"
"It was under the arm!"

under the arm by Cloonan November 18, 2013

put arm under 

When a girl with saggy tits sends you a nude and has her arm holding her tits with her arm so that they don't drag.

Dude, she captioned it put arm under. LOL

put arm under by RichardHammerbush October 20, 2015

Above the tree, under the arm 

When you get stuck trying to explain something. Not knowing what to say in a conversation.

Someone: “What does that mean?”
Me: “I don’t know, above the tree, under the arm.”

Above the tree, under the arm by Ghanoy December 23, 2018

Social Under Armour

Under Armour sports apparel that is inappropriately worn during public, non-sporting events (eg: bars, parties, classroom, restaurants, etc) in an attempt to pass it off as fashionable.

Chris: "Look at that douche bag wearing Social Under Armour."

Pete: "No wonder he is alone."

Social Under Armour by Lafferty Daniel October 1, 2008

Under Armour 

Tight fitting clothing to keep your ass warm in cold conditions, or cold in warm conditions

Under Armour (UA) Cold Gear keeps you warm, UA Warm Gear keeps you cold, UA All Season keeps you cold and warm

Under Armour by Skare November 8, 2005