Fanny
All over Ireland
The outward facing part of the female reproductive organ. Often causes problems for the Irish when visiting the USA, as fanny translates as arse across the big pond.
She told her Yank cousin she'd a pain in her fanny an' he nearly died laughin'.
She informed her American cousin of a discomfort in her nether regions, and he very nearly expired from mirth at the transatlantic confusion.