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Random
Somone who either by choice or force takes possession of or consumes the shit or piss (preferably both) of another, whether it be down their throat, up their ass, or in their vagina usually done as an act of degradation. The person usually ends up enjoying the act.
Did you hear about what happened to Alex last night? He was a total toilet slut, the bitch loved it.
A person who has a lot of anal in the bathroom
He's been in the bathroom for 20 minutes, I think he's a butt slut toilet fuck