When laying in bed with someone, facing one another, it is the awkward positioning of one's interior arm (resembling the arm of a T-Rex) which often prevents two people from getting as close as possible.
I wish I could get closer, but I've got the No Sex T-Rex arm goin' on. Maybe we could just spoon?
Proper noun usually accompanied by hand gestures signifying small arms and a mimed a chomping motion. Denotes and objectifies the awkwardness of a prevailing situation in the form of a giant imaginary dinosaur.
Girl says "how's Kimberly"
Guy says "she dumped me last week"
Girl screams "awkward T-Rex!"
Laughter.
A T-rex whose intelligence is far below that of a normal T-rex. They are known for random flailings as a means of attack, but should be considered harmless, for they will more than like trip in their attack run.
When you're fucking that baremuff and you become so pleasured that you lose the capability of your arms and you become a paraplegic. This makes your arms resemble a T-rex's arms.