A babbling, foolish person
blthrskt (without vowels)
Staten Island, NY
From Ducktales, Fenton Crackshell accountant to Scrooge McDuck...always said this... then Gyro invented a robot, Gizmo Duck, and used a secret password to get the Gizmo Duck robot suit on the person who said the word "Blatherskite"...and in turn Fenton Crackshell became Gizmo Duck...whenever he said the secret password..."Blatherskite"...
Someone who talks rubbish, mainly tall stories etc. Literally 'blather shite', but the H became a K somehow.
Don't listen to old Tom in the pub, he's just a blatherskite.