Gaffaw
a laugh that makes you feel like you’re the funniest person ever, even if you’re just laughing at your own joke.
I told myself a joke and I gaffawed like I was on stage with a bunch of comedians.
I saw my dog chase a vacuum and I gaffawed so loud my neighbor came out to see what was wrong.
I tried to tell a joke and I gaffawed so hard I forgot what I was saying.