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."
one who is totally deceitful and dishonest, and will use these particular charachteristics to their advantage by screwing you out of your hard earned cash; a con artist
Barfrat: " I sold that broken DVD player to some old lady today for $200 today. Haha, I'm unreal."
AJ: " Man, you're such a fucking chissler."