New generations are always coming up with new SLANG, and it seems like once the adults start catching on, the terms are no longer cool, and the kids have moved on to something else.

One website put together a list of 21 slang terms that are outdated . . . but were supposedly good enough that they “need to make a comeback.”  Here are they are:

On fleek . . . buggin’ . . . trippin’ . . . illin’ . . . word . . . poppin’ . . . bomb . . . flava . . . fresh . . . turn up . . . boo . . . fly . . . no doubt . . . tight . . . frontin’ . . .

Words ending in “-eezy” . . . playa hater . . . steelo . . . dope . . . swag . . . and YOLO, which of course is “You Only Live Once.”