A tagline for a surprisingly longlived advertising campaign by Akademiks. The ads featured a hot chick sitting on a stack of books in a clearly suggestive position. See brain and get brain.
Ayo man, that Akademiks ad said if I read books I'ma get brain, b! You see that? "Read books, get brain". That ill wops homie! Watch I'ma go read something now.
-in a public area-
Man#1 "Dude studying for the finals was killer and I need something to help me relax"
Man#2 -pulls out a lighter- "You downto read a book with me?"
Man#1 "SURE!"
Sleeping. This is derived from the groggy state one is in while reading a book, which sometimes sounds like they are sleeping when they answer the phone.