It's a way of saying bro, bro. I shouldn't even call you bro, thy 'tis wretched UNPIG, THY 'TIS ALSO A FRIG PIG WHO HAS SNAGGS! YON SNEAKSBY DOTH NAUGHT KNOW HOWFORE IT 'TIS TO LEAKETH THE GAMES! THY SKALLYWAG! THY DOTH THINKETHS THY 'TIS THE GODS O' PACK, DOTHN'T THY? LETETH MAKE MINESELF CLEAR TO THY, YON NICK NINNY! THY WILL NAUGHT FINDETH HAPPYNESS IN THOU WORLD O' DARKNESS, LETETH 'TIS BES YON LESSION!