when you've got to go, you've got to go; farts and boils aren't choosy about where they appear
A proverb meaning that bodily urges (like farting or boils appearing) cannot be controlled or delayed, and will happen regardless of time or place. Often used humorously.
My stomach started hurting during the meeting, so I said 'when you've got to go, you've got to go' and left my seat.
A traditional Japanese proverb. 出物 (demono) refers to farts or excrement, 腫れ物 (haremono) refers to boils or swellings, and 所嫌わず (tokoro kirawazu) means 'without choosing a place'. The phrase literally means 'farts and boils don't choose their place', humorously expressing that bodily functions are uncontrollable.