An insulting West Indian term, which implies the recipient is the blood from a woman's vagina following a period. This is not to be confused with "bumbeclart" which is a reference to shit from an arse.
eh rasclart, ya mudder, da fuckin whore - she a bumbe clart. Wa your pun pun suffer, cause you a batty boy. A mon is poking his jaheebas upa - bo!