Rock in your pocket
Referring to a boner of a stimulated man; used in a sexual context.
"Is that a rock in your pocket?"
You got a rock in your pocket?
A response used when someone includes you in their plans without asking, to which you would respond if the 'we' they are referring to is them and the rock in their pocket.
"Yeah, we're going to that concert tomorrow night"
"We? What, you got a rock in your pocket? Because I'm certainly not going."
"We? What, you got a rock in your pocket? Because I'm certainly not going."