Willow Palin's homophobic Facebook rant? That was nothing.

According to some narc classmates, Sarah Palin's 16-year-old daughter is an out-of-control party animal who once brokered a drug deal ... at 1 a.m.!

One in the morning! Sarah, do you know where your children are?!

Several former peers of the 16-year-old have gone on record telling Life & Style that Willow "chugged" vodka at a party took part in a "1 a.m. drug deal."

Surprisingly, Tre is not among the narcs quoted by the tabloid.

Lance Nezaticky says he watched Willow Palin take part in a late-night drug deal in a deserted Target parking lot in her hometown of Wasilla, Alaska.

He watched as a male driver pulled up, with Willow riding shotgun. The driver bought $20 worth of marijuana, says Nezaticky, then handed it to Willow.

"It was definitely her," Nezaticky says. "There's no question. I had met her before."

After buying roughly two grams of pot, Willow and her companion drove off. "Willow had been told that the pot was really good stuff," Nezaticky recalls.

Another peer, Matt Scott, shockingly reveals that in October 2009, Willow hid herself away at a party and took swigs straight from a bottle of liquor.

Truly staggering revelations, these.

Imran Chaudhry, who was also at the party, confirms an underage Willow was guzzling vodka: "I saw her drinking from a bottle of Monarch," he says.

"She was chugging it pretty hard."

Hey, what's she gonna do, sip that crap?