When you and a romantically significant other ignite cannabis and enact in sexually promiscuous activities.
"Hey Better, wanna get high and have sexual relations?"
"Sure Tom, I'm always down for a Stone and Bone.
an enlargement or expansion in bulk or extent, the opposite of contraction. It derives from the Latin dilatare, "to spread wide".
"Shit dude, your eyes are dilated, it must be from all of that cocaine"
"That can cause blurred vision, I better not drive."