Martin Lawrence and Will Smith clearly aren't down with Jason Kelce's shower habits ... 'cause the "Bad Boys" duo couldn't contain their disgust when discussing the NFL legend's "nasty ass feet."
The two actors addressed Kelce's recent revelation on "7 PM in Brooklyn" with Carmelo Anthony and The Kid Mero ... during a segment called "F***in' With It or F*** Outta Here," when guests give their approval or a big thumb's down on certain pop culture topics.