What is 'bookin?
Viewing profiles on Facebook for a prolonged period of time.
Bro #1: Bro, I can barely stay awake...
Bro #2: Why, bro?
Bro #1: I was up until three in the morning 'bookin.
Bro #1: I was 'bookin your mom in the middle of the afternoon and then you called.
Bro #2: That's so unbro, bro.