Self Slap Cheers

"Don't mess with the best cuz the best don't mess, don't fool with the cool cuz the cool don't fool..."

my colleague didn't want us to play play with him. so he said, "the best don't mess ok..."
until my colleague just smacked him with, "i thought it's don't mess with the best...?"

he sat there, seriously thinking for a while before he started laughing.

as he tried to recall the cheer, i heard something like, "don't fool with the fool cuz the fool don't fool..."

...what the hell was that?

then what does the fool do???

stunning pun man.