Definitions by mmmmmmmmmorning

Marvin 

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

Marvin by mmmmmmmmmorning January 1, 2011

Chuck 

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!

Chuck by mmmmmmmmmorning January 1, 2011