post humorous 

when you think of a good pun, joke, punch line or one-liner after the opportune moment of delivery. if one was to then say this joke, it would be lame and obsolete because the timing would be all wrong and the moment would have passed. typically happens when one is in an altered state of consciousness. i.e: a late joke which deserves no high fives..............if we still do that sort of thing.
Adj: post humorously

A friend had a post on facebook, " D - RUNK!!" I happened to be drunk at the time too so I commented, "Me too!!" I realized later that I was the first to comment and it would've been SLIGHTLY more funny if I had said, "Me Three!" That was post humorous.

Lame example, but there you have it. Still drunk.

post humorous by Nondey June 23, 2009

Post humorously 

Sarcastically.

To use a word or phrase mockingly, emphasizing that the term is no longer cool.

Phil: “check out my hella dank swag”
Robert: “dude, you can’t be serious.”

Phil: “naw, I’m just saying it post humorously.”

Post humorously by Linguistic Lasagna July 28, 2019

Posthumorous 

When someone laughs after everyone else stops.

Everyone laughed at the joke, but when they stopped, they turned around to see Chad laughing posthumorously at the comedian's joke.

Posthumorous by The Essayist November 19, 2009