bottom wiggling

A yukkuri wiggling its bottom. Tends to be associated with it trying to get into a tight spot or it being held up (as in attempting to get loose).

Yukkuris also wiggle their bottom when they are happy (as in case when they eat a very delicious type of food) and sometimes as a form of exercise. There are some instances when shithead yukkuris wiggle their bottoms to taunt or insult another yukkuri or, if the yukkuri in question stupid and scummy enough, a human which almost never ends up well for them.