Shitnuts is the act of a man inserting his testicles into his partner's anus, specifically a dirty one. When the scrotum comes out, it should be covered in shit.
Greg: Man, I heard you tried shitnuts with Bianca last night
Tom: Yeah, so what? I like the creamy feeling.
Greg: Tom, that's absolutely foul.
Tom: Yeah, so what? I like the creamy feeling.
Greg: Tom, that's absolutely foul.
by Dumbuss Cargleuss June 09, 2022
by THEnegrodaumus October 30, 2011