Need Help Understanding the Term "One-Up" Mentioned on JRE

I'm trying to organize it a little bit,

The phrase "one-up" can also mean to miss or skip over something, although this is not common but in this case it refers to the buttoning of a suit. In the conversation, Joe is pointing out that Jordan's suit is not buttoned correctly, missing one buttonhole and going up to the next.

Joe could have said "Are you missed a button?" instead of "Are you one-up?" to convey the same meaning.

I'm trying to make another example here:
I was so nervous during the presentation that I one-upped my slide and went straight to the conclusion without explaining the details.

donghongzi said:

Joe could have said "Are you missed a button?" instead of "Are you one-up?" to convey the same meaning.

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No.
1- He does not ask a question. He makes a statement (comment): I think you're one up. That means: I think you're one position higher than you should be.
2- That sentence that you've suggested is ungrammatical.

donghongzi said:

I'm trying to make another example here:
I was so nervous during the presentation that I one-upped my slide and went straight to the conclusion without explaining the details.

Click to expand...

No. You can't just coin a new verb and expect it to be right!