the kind of buff you only get from being in jail for multiple years having nothing to do but work out.
Like Val Kilmer's bod at the end of the movie Felon or Edward Norton at the end of American History X.

For example:

" I met this totally hot guy at the beach the other day, he was fucking jail buff! "
by sweetcheeksO7 August 13, 2008
5 Words related to jail buff

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