Green’s Dictionary of Slang

fizzle-fart n.

(US teen) a term of abuse.

[US]J. Conroy World to Win 81: If I was you, I’d go and hide my head in a pile of cowshit [...] I’d dive in it head first and let it smother me, that’s what I’d do, you little fizzle-fart!
posting at DVD Verdict 5 Jan. 🌐 I liked it [i.e. a film] (well, up until the little fizzle fart of an ending).