Synonym for FUUUUCK, but can also be used in the context of fucked, or any other synonym/form of fuck.
Originally being from Jamaica, the word combines the words "bomba" meaning bum/butt and "clat" meaning paper, so really the words just means butt paper (toilet paper) but has become one of the most popular frazes in jamaca and now the USA.
Bombaclats usage have changed over time from meaning vulgar language or its literal meaning “butt cloth” Of course nowadays days the word has seen another change in usage which is to cheer on or hype up.
A big ass or butt that you can slap any time you feel like it, it's always an excellent idea to do so. Whenever you can go up to someone and slap them on their backside it will recoil as it should.