Towelie
A one night stand with a soap phobia stays at your house and cleans their asshole on your towel. Your roomie finds it, and chases you around the kitchen. You have now slept with a towelie.  
"Oh my god, I think that Wally is a Towelie, check out the round shit stain i found".

"Towlie can't even clean his ass properly, I can't believe you fucked that. Next he will be handing you a hot lunch". 