The act of wasting someone where their arms tense up to the point where they become incapacitated and wave around aimlessly like that of a T Rex (Dinosaur)

When you get really intoxicated and you start stumbling around resembling a t-rex.

When someone doesn't pick up the check at dinner or lunch or whathaveyou. They have short arms like a T-Rex

T Rex is a specific type of handjob, where the person giving a handjob tucks their elbow into the sleeve of a short sleeve shirt, and proceeds to pleasure a man's penis with only their index and middle fingers and their thumb.

The act of having small disproportiionate upper extremities while maintaining rather large back, chest and shoulders.

When your lady is in the "reverse cowgirl" position, you put clench your hand with the middle knuckle raised (similar to the frogging punch). With this protruding knuckle you then place it on her spine and rub back in forth. The feeling is very intense/ticklish. It will cause her to moan in a weird fashion and her arms will become incapacitated past the forearms for a brief moment.

Some women also seem to do weird things with their mouths during the moment.

When you hug someone from behind while their arms are to their sides. The person being hugged can only move their arms up to their elbows therefore appearing to have short arms like a t-rex.