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'T-Rex Arm' :

When laying in bed cuddling your partner, and one arm gets trapped under both bodies/pillow rendering it useless, it is 'T-Rex Arm', i.e completely void of movement and use.Thus, similar to a Tyrannosaurus rex's arm.
Girl- Hey Todd, pass me the remote

Boy- I Can't i've got T-Rex Arm!
T-Rex Arm by P-Master-T June 1, 2009
This is the result of ataxic cerebral palsy. A person with this birth defect has one or two small and withered arm resembling the arm of a tyrannosaurus rex.
Wow did you see the t-rex arm on that chick????
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
T-Rex Arm by Killrek May 11, 2021

Baby T-Rex Arm 

Arm cramp that men may get as a result of spooning, when they can't figure out what to do with their other arm and its gets squished up next to their body
Jim had to deal with a baby T-Rex arm at work after spooning his wife all night without moving.
Baby T-Rex Arm by Ninjetturtle June 29, 2014

T. rex arm 

Kid with a fucked up arm to where it’s like a T. rex arm.
Look at that retard with the fucked up arm nigga got a T. rex arm!
T. rex arm by L. Oh L. October 7, 2022

T-Rex Arms 

After working out your biceps the following day your arms become sore and unbendable causing this condition. Also referred to as "Dino Arms".
I'm having major issues getting my shirt on this morning. I have a bad case of t-rex arms after that crazy workout.