"Kap" is an abbreviated form of the word "Kappa" meaning you're joking or just kidding (from Twitch.tv).
"Big" is added for emphasis.
"Big" is added for emphasis.
by Indy Savage September 15, 2020
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Big Kap
• Big Chungus
• Big Dick Energy
• Big Mac
• Big Gay
• big back
• big head
• big boy
• big brain
• big daddy