Green’s Dictionary of Slang

(US) an all-purpose euph. used in place of an obscenity, usu. shit n.

1997–2002		Alt. Eng. Dict. 🌐 krunk (noun) Word used in place of dirty word. Made popular on late night show by Connan [sic] O’Brian. Proper Use is, ‘What a load of krunk’ or ‘Oh boy, is the krunk going to hit the fan’.
2002		Dorktionary 🌐 krunk \krunk\adj Word used by Conan O’Brien as a substitute for any profanity eg. Krunk dat! You krunking piece of worthless krunk! I wanna krunk your krunk, krunk-nugget!