what the fuddmuffins

(interj.) Euphemism for "what the fuck."

Also "what the fuddmucking fudd," or simply "fuddmuffins."

"What the fuddmuffins, Lucas! Don't do that shit." & "What the fuddmucking fudd, that girl's name is Rainbow!" & *rear-ends someone's car* "OH FUDDMUFFINS!"

WTFDMFN