What is a slang word for piano?

There isn't really a widely accepted slang word for piano. It's such a common instrument, it's usually just called a "piano".

However, here are some terms you might hear in specific contexts:

* "88s": This refers to the number of keys on a standard piano.

* "The ivory tickler": This is a more playful, sometimes humorous term.

* "The keys": This can refer to the piano itself or just the keyboard.

* "The box": This is a more informal term, often used by musicians.

Ultimately, the best "slang" word depends on the context and your audience.