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.
Bombaclat: First used in Jamaica as slang for "Motherfucker". This word has later been used in London with roadmen slang meaning the same or different, depending on the conversation.
Jaime: Where's the fuckin food fam?!
Caleb: Fuckin here fam. Fuckin Bombaclat.
Jaime: Fuckin splash you G. Wasteman.