When 2 men (as opposed to one) hold their hard dicks together in a hot dog bun, and frot eachother with the hot dog bun. (Frotting meaning 2 men rubbing, humping, or jerking there dicks/genitals together to completion)
Boyfriend one: “It was really funny when you put your hard dick in that hot dog bun”
Boyfriend 2: “yeah we should put both our hard dicks in the hot dog bun”
Boyfriend 1: “yeah that’s a great idea, that would be called frot doging”
B8 in this context is a gay/homosexual slang term and abbreviation for the word 'Masturbate'. Often used in an online profile or advertisement to signal the desire to masturbate with someone else or as a group.
frot is another gay/homosexual term for rubbing two penises together.
In this definition 'B8 and frot' represent two or more people masturbating in a close proximity to each other and touching each other's penises as they masturbate.
I posted a Grindr profile as B8 and frot so I could find other guys to beat off with while we rub our cocks together.