A phrase popular in the LGBTQIA+ community to refer to trans men or transmasculine nonbinary individuals who adopt a more confident and exuberant demeanor once they start transitioning.
Sometimes t-boy swag is used in a light hearted, tongue in cheek way to describe a stage where trans masculine folks are new to presenting masculine and still finding their style.
"Elliot page is so hot, I love his t boy swag"
"Look at that handsome short king in the button up shirt and backwards hat - hes got t boy swag"
"Since Kai started T he's developed some real t-boy swag, he is so much more confident"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.