General Clumsiness:
* All thumbs: Describes someone who is awkward and clumsy with their hands.
* Butterfingers: Someone who drops things easily.
* Two left feet: Describes someone who is clumsy and awkward when dancing or moving.
* A bull in a china shop: Someone who is very clumsy and likely to break things.
* Have two left feet: Similar to "two left feet," implying poor coordination.
* As graceful as a giraffe on roller skates: A humorous way to describe someone's lack of grace.
More Specific Idioms:
* Trip over your own feet: To stumble or be clumsy.
* Have a knack for breaking things: To be prone to accidentally damaging things.
* Drop like a hot potato: To fumble and drop something easily.
* Have a bad case of the fumbles: To be clumsy and make mistakes, often related to sports.
Informal/Slang:
* A klutz: A clumsy person.
* A goofball: A silly, clumsy person.
* A spaz: A clumsy and awkward person (can be considered offensive).
* A fumblebum: A clumsy, careless person.
Remember, some of these idioms can be considered rude or offensive, so be mindful of the context and the person you're speaking to.