Scott Weiland had barely wiped Slash's boot print from his ass when he announced a reunion tour with his Stone Temple Pilots bandmates. Seriously: The singer was kicked out of Velvet Revolver, and then, in a matter of weeks, hooked up with his old group and set up a nationwide tour. Meanwhile, the other temperamental, asshole singer that Slash used to work with can't get a new Guns N' Roses album together after 17 years. STP always seemed a late arrival to the alt-rock party, despite its massive success — which pretty much eclipsed that of the bands it ripped off in the mid-'90s. The group split eight years ago, mostly because the perpetually drunk and drugged Weiland became so unreliable. The other guys (guitarist Dean DeLeo, bassist Robert DeLeo, and drummer Eric Kretz) gigged around with various went-nowhere groups like Talk Show and Army of Anyone, while Weiland hooked up with the mega-selling Velvet Revolver . . . and got drunk, drugged, and unreliable all over again before he was recently shown the door. The reunited STP comes to town this week. Better go see them. With Weiland's history, chances are good the tour could come to a screeching halt at any minute.