A mystery

OK, perhaps "mystery" is overstating it, but this puzzles me every time I drive by it and I'm hoping someone else can figure it out for me. Someone in our neighborhood took the time to spraypaint a relatively busy street with the words, "BUSH IS A" ... something. I can't figure out the last word. Here it is:



Bush is a KO? Bush is a HO? Bush is a XO? Bush is A-OK, but they got a little dyslexic? Did they get stopped half way through the word and not finish? Like "Bush is a KOOL kid?" I mean, none of them really make sense. Bush is a KO? What would that mean? Bush is a knockout? I think lots of things about Bush, but not that he's a ho or a ko. Or an XO.

Please help me so I don't have to slow down every time I pass this anymore.