Exclamation. A contraction of the extremely offensive Afrikaans phrase "Liewe Jesus se Bloed Poes" (translates to Dear Jesus's Bloody Cunt). Only ever use this phrase in an argument to completely eviscerate your opponent when you are close to defeat.
Hein: "Fuck you"
Rein: "Nah, Fuck you"
Hein: "Fuck your mother"
Rein: "LJ se BP"
big lightning bolt takes both of them out.