Drop science, drop knowledge
From Rap Dictionary
drop science, drop knowledge
- To demonstrate wisdom or skill. "And yo, I'm droppin' science like a school text book" -- Tragedy the Intelligent Hoodlum (Microphone Check) 
- To "drop knowledge" in my hood means I got a dime on my dick, e.g.: "At college, constantly gettin ' bitties to drop knowledge".
- To "drop knowledge" (SoCal) means to defecate (take a dump)