Yo Mama's Double Snap

Listen here, Robert_puck88, you are a human who probably poops your pants and definitely doesn't know much about humor. This joke is using 'yo mama' and putting a hyperbolic level of fat on her. The joke implies she is so large that Thanos, a character famous for snapping his fingers and eliminating half the universe, had to snap twice to impact her mass. It's a morbid insult because it uses a villainous action to describe how fat she is. Get it, moron?