How do you punctuate know what I mean at the end of a sentence?

"Know what I mean" can be punctuated in a few different ways, depending on the context and intended meaning:

1. As a complete sentence:

* "Know what I mean?" (This is a question, so it ends with a question mark.)

2. As a phrase within a sentence:

* "I'm really tired, you know what I mean?" (The phrase is part of the larger sentence, so it uses a comma.)

* "I'm really tired—you know what I mean?" (The em dash adds emphasis and separates the phrase.)

* "I'm really tired; you know what I mean." (The semicolon is used to connect two closely related independent clauses.)

3. As an interjection:

* "I'm really tired. You know what I mean!" (The exclamation mark emphasizes the sentence.)

Ultimately, the best punctuation choice depends on the specific situation and the tone you want to convey.