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 thatthe 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.
A phrase used a a warning towards a 3rd party in a confrontation whom you may/or may not have issues with that if they keep on doing/saying certain things, a fight can ensure.
Girl on end of the phone - "Who you texting?
Girl on phone - "Oh, just Mark"
Girl on end of phone - "Oh well, Tell him I said 'Hi'"
Girl on phone - "Mark, Nicole said Hi"
Mark - "Nicole,... Oh SHE CAN GET IT!"