THO

Titties Hard On. In cold weather girls tits seems to get hard, therefore, creating the saying THO.
Also, it can be referred to as a group of friends that have been together throughout highschool and sit against a wall. They only associate with eachother and rarely with any of the other fake annoying people around them.

Dude that girl has THO. check it.
or
Do you know who we are? we are THO. and we sit at the wall.

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