I'm not a big rap guy, but once in a while something latches onto my brain and won't give up. Usually it's due to a sample, but occasionally it's a lyric that draws me into the music. That's what happened with "Freaks and Geeks" by Childish Gambino, aka Donald Glover of Derrick Comedy and Community fame.
The lyric in question?
"I am running this bitch; you are just a dog walker."
The song is full of gems like that.