bacteria enema
when an automatic flush toilet flushes before you have a chance to finish, therefor spraying the filthy toilet water up into your ass.
guy 1 "stupid auto flush toilet gave me a bacteria enema again."
guy 2 " sick dude, better go get an STD test"
guy 1 " second time this month"
guy 2 " sick dude, better go get an STD test"
guy 1 " second time this month"