A person who plays Sea of Thieves, but only plays the arena mode. In this mode, all they do is go to a fort and fight other players on the island. You can tell someone is a TDMer if in the arena lobby they spam the text "I am on the island!". They can't realize and accept that the game wasn't meant to be played that way, and always bitch about the hit registration. They also most likely will be cheating and still brag about winning, or if they lose DDOS you. In real life you can smell them from 50 feet away and they don't leave their mom's basement, regardless of age.

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.

some retard that plays sea of thieves competitively and keeps track of scores while lying about how many shots they hit. also occasionally cheats and dosses to protect their fragile egos.