Funny-Bunny is a phrase meant to call someone an idiot in a simplistic way. Repeating the phrase over and over causes confusion and is a way to insult those that are not aware of the joke. The more they ask what a "Funny-Bunny" is, the greater the fool they are.
"You're such a Funny-Bunny!"
"What does that mean?"
"You just proved my point...Funny-Bunny"
The opposite of not funny did laugh if someone says this to you then you're basically a god you can flex on bill the guy who is so unfunny that your ass cheeks are so tight that not even a gay man can get in
Clown: Why don't scientists trust atoms
Laugher at anything: Why?
Clown: BECAUSE THEY MAKE UP EVERYTHING
Laugher at anything: Funny, Did laugh
Laugher at anything: HAHAHAHAHHAHAHAHHAHAHAHHAHAHAHAHHAHHHHHHHHHHHHHHHHHHHHHHHHHAAAAAAAAAAAHAHAHAHHAHAH