
Klutz
Casual Tone
Use 'klutz' in informal situations, among friends or in light-hearted contexts. It's not for formal occasions. 
Not Insulting
'Klutz' isn't usually meant as a harsh insult. It's more of a teasing, playful way to describe someone's clumsiness. 
Self-Deprecation
People often call themselves 'klutz' to make light of their own clumsiness, showing a sense of humor. 