If you wear a beret in the back part of the village, you'll get kicked in the nuts. It's a rough 'hood.
sorry to disappoint, it don't mean backside like 'booty,' but backside like,
1) the back side of a building, behind something where few people go.
2) the 'dark side' - illegal or hidden side of something.
hidden side of xxx ★★★☆☆ SUF
SUFFIX meaning, 'hidden side' or 'dark side' of XXX.
backstabbing (verb form: うらぎる！）