Blending is what you and your gun are doing in the middle of a gun fight with many people. If your gun is blending, you're packing loud noise and making a full on riot, kind of like a Blender.
"That crazy motherfucker was blending the whole block up with his UZI! "
"Oh? On god?!"
"Plays" is another way of saying money. If you make a lot of money, you have a lot of plays.
Jerome: "Yo, you trying to get a pizza?"
Tyrone: "Hell yeah man, I made some plays this week!"