Engaging in typically, romantic or somewhat sexual behavior with other men, for the purpose of personal development not a long term relationship. People Blue-shirt to prepare both participants for future relationships with other people.

An play on the term “red-shirting” because blue shirting is often done in college.
Greg: Why are you always hanging with Todd? That’s gay.

Jim: We’re not gay we’re just blue-shirting until graduation. His girlfriend cheated on him.
by Spookyroni December 16, 2018
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Hope you're bringing your collared shirt into the VIP room bro!

Giddy up bitch, grab a collared shirt and let's ride!
by vdub4motion March 18, 2023
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A fat fuck who constantly pulls their shirt away from their gunt to give the illusion of not being obese.
Jon keeps pulling his shirt away from his gut. What a shirt stretcher.
by m4gssssss August 6, 2017
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A day in which guys wear no shirt all day. Celebrated on October 15th.
When’s guys wear no shirt day.
It’s on October 15th, maybe you should start working out.
by Anomanous October 13, 2019
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Shirts that really dont have a brand on them.their just sort of a shirt.
These can be bought at low retail stores like goodwill.

American Eagle,*Converse*,abercrombie and other name brand companies are exact opposites.
Devon:did you see tony walking around with that no tagged shirt?

Kevin: lolyeah.

Kevin: he has alot of no tagged shirts u c.
by Converse_Dottor February 18, 2009
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A cardigan and shirt which are combined together to make one item of clothing; often worn by Steven Clement.
"Wow Steve - I love your cardi-shirt!!! You look so high end".
by RachieRachRachaelRachelle October 16, 2013
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A flashy and sometimes un-tasteful piece of clothing , usually a really bad Hawaiian short-sleeve button-up.

Could also apply to someone who doesn't seem to look good in modern fashion or has retired to Florida.
Tom- Jeez Mat did you see Jake wearing that ugly shirt?

Mat- Yea that's such a Brett Shirt, he should hire a personal clothing coach.
by The Space Jew April 21, 2019
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