wtf? I've used that expression on RB and all americans got it. It's a well-known expression man. I've seen americans use it in bars, like "even if I urinated in ya cup, you still couldn't take the piss" i.e. you still couldn't diss me

well guess you learnt something today then, lol, no wonder that line made no sense to you

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Fee Fi Fo Fum, now bitch I'm a giant
And your ass is like Jack, but your magic beans is wack
Skills is what you lack
I'm like a Benz, you ain't even like a Cadillac
Ya more like a Reagal
I'm a pittbull and you's a beagel