What is Fan-dabby-fuckin-dozy?
1.
Rarely used in conversation, it is used as a sarcastic comment by someone who is angry. Lee Evans once used this in one of his shows
John: Im sorry jeff but i ran over your cat
Jeff: WHAT?!
John: Dont worry tho, it didnt feel anything
Jeff: Fan-dabby-fuckin-dozy! (punches john)