Getting a good thorough handjob. Specifically can be used to indicate when a girl loves your cock and balls so much that she has a great time playing with them, jerking you off, pulling, proding, wanting to make you cum.
Usually requested by the girlfriend when she wants to please you, or when she can't have sex cause she's on the rag.
Her: "I want play time"
Me: "Niiiiice... Let's go..."