A person born with arms disproportionately short compared to the rest of their body; similar to the proportions of the Tyrannosaurus Rex dinosaur. Side effects of this condition include being unable to masturbate oneself or drink from a cup.
OMG did you just see Adam try to down his pint? because of his Tyrannosaurus arms he just poured his beer all down himself!
When going out with peers to a bar or restaurant and the same person never offers to buy a round, hence they have the short arms of a Tyrannosaurus and cannot reach their wallet.
-Wow I spent a lot of money last night.
-Yeah we paid for Joe all night. He couldn’t reach his wallet because of his tiny tyrannosaurus arms.