A Midtown coffee shop dishwasher who was slashed in the neck during a senseless argument over an occupied bathroom lost a massive amount of blood in the daytime attack and needed 19 stitches to close the gnarly wound, prosecutors said Saturday.

Details about the Wednesday attack outside Moka & Co. , an organic Yemeni coffee chain on W. 34th St. near Seventh Ave., were released as Wagner Louis, the man who slashed the 50-year-old employee, was ordered held without bail.

Louis, 32, is accused of attacking the dishwasher after the worker told him that he couldn’t use the bathroom because it was occupied.

“He was, like, ‘Wait, wait, there’s somebody in there,’” Moka & Co. employee Zainab Tabasi told the Daily News Thursday. “And then that kind of turned into an argument, I don’t know ho

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