(adj.) When something is embarrassingly memorable.
Friend 1:"Remember that time I took that girl who hated spicy food to a Mexican restaurant."
Friend 2: "Yeah man! That was so anticlassic."
The opposite side of the spectrum from class, yet no less valid. James Bond is class, with a slick haircut, a shaken martini, and a gold watch. Jimbo the karaoke king is anticlass. He's got a mullet, a Miller High Life (champagne of beers, come on!) and an Indiglo from Wal-mart. To Jimbo's constituency, his brand of class (anticlass) is just as great as James Bond's peers find his classic form.
I brought a 40oz Old English to the party last night and felt the poster child of anticlass.