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A Twicer is when someone lets out a fart so hard it sounds like a trumpet and then poops their pants at the same time. It’s like a fart and a shart having a baby.
My uncle did a Twicer during a Zoom call and I had to leave the room.
She Twiced in the middle of a speech and the whole room was silent for 10 seconds.
He Twiced during a karaoke night and the mic picked it up loud and clear.