I'll pee your pants
You’re so f***ed off you promise to pee in someone’s pants. It’s like the lowest level of revenge.
Your friend said you’re the worst. You say, 'I'll pee your pants!' and laugh.
Your dad said you’re gonna fail. You yell, 'I'll pee your pants!' and run out of the room.
Your crush said no. You whisper, 'I'll pee your pants!' and cry.