Used to describe acts which would be considered foolish or pleasure. More often than not however "play play" is preceded by the word "no" to indicate the seriousness of an event.
Person 1, "Yo what up T."
Person 2, "Aint shit what you want?"
Person 1, "This aint no play play, get over here."
Person 2, "(click)"
Person 2 has now been alerted that there is serious business to be had and many dolla dolla bills to be made.
Since the speaker has added this expression, the listener can not mistake that Becky is pregnant because only by lying about her pregnancy would the statement be considered play play. Since Becky really is pregnant, this is for real real and can not be a lie or joke.
Briana: Daquan told me he be on the phone with you all late and shit.
Claire: Girl, that boy is my play play!We ain’t got anything serious going on. He’s just my entertainment when I’m bored.
Briana: damn Claire, You a savage!