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.
Prices shown in USD.