ちょけ

person who jokes around all the time

Word type: 

Standard: 

ふざけたことをする(いう)ひと

Standard kanji: 

ふざけたことをする(言う)人

Example: 

さとしはちょけやけど、サッカーする時だけはまじめやな。
Satoshi is a real clown; the only time he's serious is when he's playing soccer.

Commentary: 

This comes from the verb ちょける.

Some people may say おちょけ instead.