turkey season
When you grab your penis (it has to be small enough when flaccid to fit entirely in your hand) and pull upwards repeatedly, chasing another person with your jiggling scrotum while shouting "turkey season!". It is so named after the sac's resemblance to a turkey's neck.
"You almost done in there? I gotta pee. Wait, what are you-"
"Turkey season!"
"Oh, god, no."
"Turkey season!"
"Oh, god, no."