Is the phrase not boss of me correct grammar?

The phrase "not boss of me" is grammatically correct, but it is informal and might be considered rude in some contexts.

Here's why:

* It's a contraction: It combines the words "not" and "is" into "not" for brevity, which is common in casual speech.

* It's informal: It's a colloquial expression, more suited to informal settings like conversations with friends.

* It can be rude: Depending on the tone and context, it might be perceived as disrespectful or aggressive.

Here are some more formal alternatives:

* "You're not my boss."

* "You don't have authority over me."

* "I don't take orders from you."

The best choice depends on the situation and your desired level of formality.