Em does this quite a lot lately @ associative puns... sometimes not even blatant puns but just speak using a running 'theme' of words or phrases for a little period.
He does it a few times in this song but it was particularly smooth and brilliant here:
"That's what I call pitching a bitch
That's why I'm swinging at these chicks on sight
Long as I got a bat and two balls...
It's foul but my dick's on strike"
So that's 5 instances of word or phrase pun'age in that lil section there, without compromising the integrity of the sentences - as in, those sentences are natural, legible and work with or without the puns; the puns are simply incidental.
Thank god he spent that extra time writing because this step-up in quality vs. some of the truly abysmal writing of Recovery will really stand the test of time.