Someone who is very sweaty or obsessive of winning in a videogame and, tries their hardest to ruin fun for others players. They are typically shut ins who do nothing but sit around and troll people for their own pleasure.
Person 1: I was playing Fortnite yesterday and I got chased around the whole map by this one dude.
Person 2: Fat tad?
Person 1: Yeah, the absolute fat tad wouldn’t leave me alone!
Person 2: Fat tad?
Person 1: Yeah, the absolute fat tad wouldn’t leave me alone!
by Cyanchy July 20, 2018
Get the Fat Tadmug. by realkawaiipineapple2145 October 6, 2022
Get the fat whalemug. 
by The fanboy8775 August 23, 2020
Get the Fat boosmug.