This is an alternative way of saying "Bless" with a lisp-type pronunciation. More commonly used to imply the liking of something and not used as a farewell.
Alex - Yo Bealey, I just got a fat sack of grade!

Bealey - Yea thats bleth
by AlexBealey January 12, 2009
Get the Bleth mug.
omg ! the guy just blethed after being stabbed in the gut
by patryk_baitmen November 9, 2023
Get the bleth mug.