Arms with excessive cellulose or fat hanging from underneath the bicep. The fat is flabby and flaps like an uncooked tortilla. Expression possibly originating from from South Texas (e.g., McAllen, TX) with respect to large women grinding out tortillas in restaurants.
Dude, Sandra's got some awful tortilla arms. Maybe she could use them as a parachute like a flying squirrel.

Tom, as your wingman, I cannot allow you to go home with a woman with tortilla arms and a beer gut.
by BoredLawStudent1776 May 22, 2009
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A symptom after getting the Covid Vaccine.
I got my covid vaccine yesterday and I cant lift my arm high. Totally have T-Rex arm
by Killrek May 11, 2021
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Physically weak individual, a person who wouldn’t be able to carry you if you got shot in a firefight.
You looked like T Rex Arms out there when you attempted over and over to buddy carry that guy.
by LilpumpPoopdollar April 06, 2019
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T-Rex arms, formallly mistakenly nine as Raptor Arms, is when you shoot a jump shot while shortening your follow through mimicking that of a T-Rex.
“Yo Dom peep my T-Rex arms!
by StrongGotItGoingOn September 19, 2019
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In dodge ball, one who can swing the ball side armed and must be 300 pounds plus.
In elementary school we had a teacher we named the one armed balboa. She could hit anyone with a ball at deadly force.. This was before political correctness.
by Petesbeeps July 15, 2017
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The unbendable arm is when you put your right arm on someone else's shoulder and without flexing, have someone push down on your arm. If done correctly, your arm won't bend...

If you happen to be brave and have a tough arm, then you can have someone hang from it, and do pull-ups if they're up for it
Yo Julie, come hang on Brandon's Unbendable Arm!

The Unbendable Arm is trippy yo!

Let's try The Unbendable Arm Tonight at my party!
by Bitsy-Boo October 03, 2010
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