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1.
An adjective describing a person or thing as "dirty," "filthy," as being outside the norms of society, or as lacking in any sort of decorum whatsoever.
"Those kids went to see the movie 'Rent,' but they've never seen the play, those classless fucks."

"The mustard stain on Bill's v-neck t-shirt made him look completely classless."
by drcrime March 07, 2006