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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The unusually deep aqua-blue shirt that adorns the ever so beautiful torso of Sherlock Holmes ; Alike it's cousin, The Purple Shirt of Sex, it is renowned for sending all who gaze upon it into the throes of blind lust regardless of gender or sexual orientation; a potent aphrodisiac. It received it's "bliss" name because of the visual bliss it becomes when worn by a blue-eyed Sherlock, making them a special, highlighted kind of blue.

It's first appearance is in "The Six Thatchers", the eleventh episode of BBC's "Sherlock" starring Benedict Cumberbatch and Martin Freeman.
Benedict Cumberbatch's muscles show more in the Blue Shirt of Bliss, being he'd just finished filming Doctor Strange.
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the new blue shirt that benedict cumberbatch looks mighty fine in. (inspired by a tumblr post.)
"OMG did you see the new episode of sherlock where he wears the the blue shirt of bliss???"
by danimcintyre03 February 1, 2017
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