Bring Your Own H.I.V. (BYOHIV) - a particularly ghetto party where the attendees are suspect to HIV infection.
Spoken with BYO and HIV as separate words
Jethro: Hey man, did you go to Tyrone's party the other day?
Edward: No way, the place was in southeast Fresno. I wouldn't stick my dick in any girl there.
Jethro: I wasn't as fortunate, it was a BYOHIV.