The master of my domain, yes I am no Costanza
“Master of my domain” is a euphemism for masturbating.
Costanza is a character in Seinfeld by which the mixtape is based. He’s caught masturbating by his mother which leads to him, Seinfeld and the others having a competition to see who can refrain from masturbating the longest.
In the end Costanza loses… Go figure…
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