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Used to indicate truthfulness or a lack of sarcasm in the twitch community. Kap is short for Kappa, the emote for sarcasm or an ironic statement. The the phrase is usual used by someone attempt to defend a highly unlikely and doubtful claim
This is the last video before I end the stream, no kapp

No Kapp, I literally did a double backflip last night at the party
by pseudoLiquid May 27, 2020
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