Top definition
The opposite of loose unit; to get mortally fucked up to the point of not remembering the night but still somehow making it back to bed.
Katie: "I think I remember jumping through my window to get back in"
Harvey: "Katie... you're a fucking loose unit"
Katie: "Mate I am a fucking.. TIGHT UNIT!"
by HarvDaddy February 21, 2018
Get the mug
Get a tight unit mug for your mate Callisto.