An incorrect variation on the exclaimation "D'oh."
As seen in the Simpsons episode "Burns' Heir," when Burns tried to convince Bart that his family doesn't miss him, and hires actors to portray them on a video feed. But, the Homer actor flubs his lines, saying "B'oh" instead of "D'oh."
Homer Actor: (odd voice) I do not miss Bart at all.
Marge Actor: (odd voice) I am glad he's gone.
Lisa Actor: (odd voice) As am I.
Homer Actor: (drops) sandwich B'oh!
Almost as bad as MTV. Nearly every song played there is only rap music taken from the Top 40 list, which is basically crappy poetry spoken rhythm over shite techno beats.
A term used not only when a party thrower can not supply all of the booze at an up comming party (Bring Your Own Beer), but also used when a guy throwing a wack ass party can not get enough females to come..in this instance: (Bring your own Bitch(es)). Both ways are usually a clue to go to a different party.
Party thrower: hey man, I'm having a party tonight, unfortunately it is B.Y.O.B. in both reguards.