Is it grammatically correct to say the phrase eat off of something or something?

The phrase "eat off of" is grammatically correct, but it's considered redundant in most cases. The preposition "of" is already implied in the preposition "off."

Here's a breakdown:

* "Eat off of" means to eat from the surface of something. For example, "We ate off of the picnic table."

* "Eat off" conveys the same meaning more concisely. For example, "We ate off the picnic table."

Therefore, it's more natural and generally preferred to use "eat off" instead of "eat off of."

However, there are some rare situations where "eat off of" might be acceptable:

* Emphasis: If you want to emphasize the act of eating from the surface of something, "eat off of" could be used. For example, "They ate off of the dirty plates, without washing them first."

* Informal Speech: In very casual conversation, "eat off of" might be used, but it's best to avoid it in formal writing.