Gary
Although the pronunciation is a bit different “Gary” is essentially the Japanese word for “diarrhea”. So, if your name is Gary, maybe come up with a pseudonym while visiting Japan.
They do have "Fart hinder" though and "Fart kontroll" (Speed gauge).
And while we're on the subject, Gift means both Poison and Married.
Slut means end, so yes there is a "slut station" which is the final station on a bus route.