"He wears tight shirts" is slang used to subtly describe a guy who likes guys. Someone who wears a tight shirt could also like women, but the important thing is that he kisses dudes.
This phrase was first used to describe superheroes from Marvel Cinema, as the male superheroes who wore very tight shirts often liked men.
Sarah: Oh, that guy's cute! Is he single?
Sam: I wouldn't flirt with him if I were you, i think he wears tight shirts.
When a person is heavily stressed and / or volatile
Mark: woah, James is on tight pins today.
Ana: I know, best to give him some space to cool down.
When someone is stressed to the point of being aggressive and rude.
Mark: James is on tight pins today, best to leave him alone for a bit
Ana: sounds good. We can give him some time to cool off
When your asshole/butthole is tight normally if it’s too tight you finger it
Shane’s big dick couldn’t fit in toms tight asshole so shane stuck his fingers and toms mouth and shoved them up his asshole, he wiggled his fingers a bit and then tried to fit his dick in
When you are very tight while wearing a dommy.
'Wow he is so dom tight'
The act of spending too much time in a project while using methamphetamines.