Typically used for an unseen companion that is on a vacation with you. Usually they are unattractive or fat but paid for the trip so there you are.
Damn, Linda is always on vacation but you never see who she is with. It must be her ghost boo taken all her pictures.
Tina is unemployed and broke how is she in Italy? Oh her 60 year old ghost boo financed the vacation.
It's for your lover, it's like boo bae but you don't want to talk about boobs anymore
Hey boo babe, wanna move in together we've been seeing eachother alot
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!"
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"