
I have had two streetpasses from a guy who named his town MtNipple. His mayor name was no better. Judging by the times and place, I'm pretty sure it was a teenager who takes the train after school. Why am I not surprised?
There was also 'Nice', which really is self explanatory.
Came across a town named トイレ in the Dream Sweet, and one of my friends named her town CoolPool.
トイレ - toilet