Kiwi (NZ) phrase meaning to act like an idiot, or being unintentionally dangerous. Used to describe people (especially young kids) who are, e.g. playing dangerously on a busy road with a ball and running around without a care. Also refers to people who are just saying stupid things. A somewhat related synonym is dicking around but clowning around refers more to idiotic actions.
"You two kids, dont clown around on the road! You might get hurt!"
When you have to preform complicated maneuvers in order to shave the pubic hairs of the rectum area that are hard to reach, but in the process end up looking like a fucking circus clownacrobatic nigger.