(adj.) A complete and utter eyesore.
Steve: What do you think of these paint samples? I like this color best.
Joe: Aww, man, you can't do that! That paint color is so 90's internet!
Jan: That sweater is so ugly, it's completely 90's internet.
Billy: Yeah, well YO'MAMA is 90's internet.
Bob: OK, I can't top that, you win.