Buttshit
Different than the more ambiguous term "shit", Buttshit refers to the actual shit from a butt.
That smells like buttshit.
Buttshit
Referring to something unfair or upsetting, different from Bullshit in that it does not refer to a lie or untruth.
Yo dude I just had the best sex ever with your girlfriend! "That's Buttshit!"
buttshit
severe excrement pertruding from the anal cavity during severe anal penetration with a female.
Yo that bitch buttshitted all over my dick, cuz