1.MagicalNinja: "Yo man my girl knows how to suck it long and suck it hard"
2.Douchebag: "Man you suck."
Magical Ninja: "Hey, you know what, suck it, suck it long suck it hard."
To ask someone "why do you suck so hard?" is a sexual pun that refers to oral sex sarcastically, while generally implying that the person just REALLY emphatically sucks.