Place it right after the fail lands, then follow it with the Emotional Damage meme for a stronger follow-up, or lead in with a short Bruh sound before the groan for a slower build.
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Several men groan at once for about four seconds, their voices blending into one low, over-the-top chorus. The effect is funny and absurd, making embarrassment and pain feel shared and theatrical, so listeners get the reaction straight away with no words needed.