Jamaican patios expletive used to express surprise or disdain. Used in a similar way to 'fuck' in English.
The literal translation is bum cloth. I.E. something that you wipe your bum with after having a shit. It has the same meaning as raasclaat (arse cloth) and is similar to bloodclot or pussyclot (blood cloth and pussy cloth respectively), both meaning sanitary pad.
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.