(about sexual acts, especially between men, and also about excrement as an accompaniment to sexual acts, all described in vulgar street language, so this posting is massively unsuitable for kids or the sexually modest)
Two messy situations. Anal intercourse sometimes involves the mess of excrement — feces, inadverent (oops!) or intentional (yes!) — and American gay usage has supplied vocabulary for both situations (now extended to women, as well as men, as receptive partners in anal intercourse).
This is as far as I will go using distanced, technical language; from now on, I’ll use the current street language — heavy in F-bombs and S-bombs, among other things — of my sources. This isn’t just a stylistic decision; again and again, it turns out that the distanced language is imprecise and fuzzy, while the street language comes with specific and detailed reference — just as you would expect, because the distanced language is designed to avoid embarrassing reality, while the street language needs to be clear on details that affect how we conduct our everyday lives.
