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You need to pee so bad it feels like a dragon is sitting on your bladder and it's yelling at you.
I had to pee like a monster during the final round of the spelling bee. I spelled 'antidisestablishmentarianism' and then ran to the bathroom.
At the movie theater, I had to pee like a monster. I almost peed in my seat.
During a Zoom meeting, I had to pee like a monster. I said, 'Excuse me, I need to go to the bathroom,' and my boss said, 'You can go to the bathroom.'