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.
Someone who reads only romance books is because the lack of romance in he/her life. They are either lonely and want to experience thru other people stories.