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When something so good happens on screen you feel like you're gonna explode from pure joy. It's called gachiGASM because it's like a gas explosion in your brain.
When Billy drops a gachimuchi and the chat goes full gachiGASM.
I saw a noob get jebaited and I did a gachiGASM in the chat.
My mom watched a stream and she did a gachiGASM and I thought she was having a seizure.