IF you have a Marvin, it is to show your bra as a shirt maybe a very lowcut
The lower body of equivalant is a chuck
This can be used as a sublte way of telling a friend that their on show
Girl 1: *talking*
Girls 2: You've got a marvin
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This is a codeword to say that you underwear is on show usually lower body.
The Upper body version of this is a marvin
Girl one:* dancing*
Girl two: you have a chuck sort it out!