What do you call a long word or phrase that is difficult to say?

There isn't one specific word for a long word or phrase that's difficult to say. However, here are some options depending on the context:

General:

* Tongue twister: This is the most common term, especially for phrases that are designed to be difficult to say.

* Unwieldy: This implies a word or phrase that is simply too long and cumbersome to pronounce easily.

* Mouthful: This describes a word or phrase that is difficult to say because it takes a lot of effort to pronounce.

* Awkward: This suggests that the word or phrase is difficult to say because it is unusual or unfamiliar.

* Challenging: This is a neutral term that simply acknowledges the difficulty of pronouncing the word or phrase.

More specific:

* Logorrhea: This refers to excessive, incoherent, and often rambling speech.

* Sesquipedalian: This refers to a word that is very long and pretentious.

Ultimately, the best term to use will depend on the specific word or phrase and the context in which you are using it.