The reason the world hates America.
Also synonymous for one who's skin has fused to their computer chair.
Won't get up to eat, shit, drink, or socialize for anything. Due to this condition, a Tsin will live it's life through text games, screwing over anything and anybody he possibly can.
The doctors tried to remove the boys skin from the seat, but in the end, they just determined he was Tsin'd for life.