Green’s Dictionary of Slang

1. a disgusting place.

2006		B. Matthews Intractable [ebook] ‘Pissed off? I was pissed off all right. Straight to this fucking shit pile’.
2014		J. Porter ‘Good Luck in Puerto del Oro’ in ThugLit July [ebook] One. Fucking. Week. In. This. Shit. Pile.

2. see shitload n. (1)