Proverbial ass off

Humor, emphasis.

Thanks a lot, AlpheccaStars!!

Still a little vague to me....

Does it mean that (A) the movie was funny or the movie was (B) a total failure?

And "proverbial" means "famous", that I am famous for laughing at some kind of movie?
Thus the expression being emphatic?

pructusAnd "proverbial" means "famous", that I am famous for laughing at some kind of movie?

No. This usage is a bit hard to explain.

He is treating the expression "laughing my *** off" as a proverb or saying, and giving that expression much more historical credibility and reputation than it actually has. It emphasizes the statement and adds a huge me

Thanks so much, AlpheccaStars!!

I seem to understand what you mean about "proverbial".
And there was no entry #6, there....
Did you mean #5?

*******

5. having become an object of common mention or reference:

your proverbial inability to get anywhere on time.

********

By the way....
"laugh at something"... Can this expression mean

pructusDid you mean #5?

Yes, it was a typo.

pructusBy the way...."laugh at something"... Can this expression mean to "literally laugh, seeing something"

Yes.
The child laughed at the clown.

I see... I see....
Thanks so much, AlpheccaStars!!