Bombaclaat refers to an underwear. The root Bombo means ass, thus an ass cloth or underwear and not a tampon as some mistakingly say.
Most commonly used as a swear word in Jamaican society. It can be very offensive to some. It can also be used as an adjective like fcuk.
back before the use of tampons, women used cloths to hold their excrement after their period. So Bomba is referring to their Bum, and Clat is Cloth. Bum Cloth, a rude sayin in countries where this term is used.
other
It literally means butt cloth but its used to swear at people or because something fucked up etc.