Green’s Dictionary of Slang

shitfuck! excl.

[shit-fuck v.]

a general excl.

[US]J. Bouton Ball Four (1981) 199: ‘Oh shitfuck,’ Joe Schultz said [...] ‘Oh fuckshit’.
[US]J. Wambaugh Blue Knight 243: ‘Shitfuck,’ grumbled the clerk.
[US]D. Hecht Skull Session 179: Shitfuck!
[SA]A. Lovejoy Acid Alex 217: Shitfuck, there’s not enough blood. I fucked up.