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Gaiyaak is when you yell it at someone who just said Bruh to make them feel like an idiot. It's like throwing poop at a kid who just tripped.
Bruh? Gaiyaak! I'm still smart, you're still dumb.
He said Bruh during math class. I said Gaiyaak and got a detention.
My friend said Bruh when I spilled soda on him. I yelled Gaiyaak and he cried.