What it means
A proper heavy Jamaican swear for when shock, rage, disbelief, or pure fed-up energy buss out your mouth. You can fling it at a person too, but that’s straight disrespect, not playful banter. It hits hard because it comes from raw bodily imagery, so if you’re not from the culture and you toss it around cute, people will clock you fast.
Usage examples
"Bloodclaat, yuh see di ref? Man rob we broad daylight, mi nearly fling mi phone. Next time, mi stay calm, but right now mi vex bad."
"Bloodclaat, mi miss di bus again, now mi haffi wait a whole hour inna di hot sun."
"Him call mi a bloodclaat liar inna front a everybody, so yuh know it turn into a big argument."
"Bloodclaat, di whole place dark and mi phone pon one percent. A wah kinda badmind evening dis?"
"Yuh hear weh she tell di manager? Bloodclaat, mi nearly choke pon mi juice when she seh it."
Where it comes from
It comes from Jamaican Patois blood and claat, with claat meaning cloth. The word points to a bloodied sanitary cloth, which is exactly why it carries such a brutal charge. In Jamaican speech it’s long been one of the strongest curse forms, not some light exclamation you can sprinkle anywhere.