1.) The Mexican pronunciation of "Jesus."
2.) A more playful/sarcastic/humorous/et cetera way of saying "Jesus." Is used in place of Jesus. Also used to emphasize a point or statement.
Only to be used online. Do not say haysooz in real life unless you are addressing someone who's name is actually Jesus, or else you will sound like a complete asshole.
Elle: I just had a Skarsgasm.
Matt: Haysooz! Lady Gaga's Alejandro music video is so explicit!