Is the phrase used mainly in south florida to describe the sexual appeal of a person, "you can get it" is meant in the sense that the person (who can get it) is sexually appealing enough to the person making the statement, that at any point in time, the person can get "it" meaning sex.
"Hey wussup Maria?"
"Hey Dre, whats up?"
"I just thought I'd let you know.....YOU CAN GET IT!!!!!"
;)