Phrase "mad david" is used to describe an unbelievable cringey moment that gave you goosebumps.
Kevin> 3 out of 3? No its 3! Get it?
Paolo> Thats mad david bro
so cringy it gives you goosebumps.
Kevin>That's not 3 out of 3.. that's 3! Get it?
Paolo> Thats mad david bro