Looking like total crap. Also FUBARed.
At a manufacturing facility, for example, an engineer receives his prototype parts from the toolmaker and says after a brief evaluation, "These parts look like boo dammit!"
Jeans, or any pants in general, with cut-outs or slits in the kneecap area. An odd fashion trend, for showing off your knees.
"Ooh Jamie, love your new knee-ka-boo jeans! Where'd you get those?"
I just picked up a binda boo, who should i binda boo?
When a friend of yours has recently started dating another, and is suddenly unable to attend and social gatherings because he is with said boo.
"What happened to Jim?" "He got a case of the Boo Flu, we won't hear from him until he is single again"
When you and your significant other are sharing a cigarette but they keep forgetting to pass it back to you for your turn.
Pass that cigarette back (man/woman), quit being a boo-gart.