Green’s Dictionary of Slang

four-eleven n.

also 411, four-one-one
[the US phone number for information]

(US black/campus) information.

[ Borowitz & Hirsch Square Pegs Episode 10, 13 Dec. [TV script] Jennifer Dinuccio: Going to the Grease [a diner] is about as cool as someone with a tin mouth, ok? LaDonna Fredericks: Girl, if you know someplace cooler, I want to know. I am dialing 411].
[US]T.R. Houser Central Sl. 23: four-one-one Information.
[UK]J. Mowry Six Out Seven (1994) 21: He gave them the full 411 on that: it looked lame.
[US]A. Heckerling Clueless [film script] Here’s the four-one-one on Mr. Hall. He’s single, he’s 47, and he earns minor duckets for a thankless job.
[US]Ebonics Primer at 🌐 four-one-one (411) Definition: to give or receive Information , coming from the phone number for ‘information’ Example: What’s the 411 on the 187, we best be look’in out 24-7.
[US]T. Fey Mean Girls [movie script] So, you guys, what is the 411? What has everybody been up to? What is the hot gossip?
[US]M. Karp Rabbit Factory (2007) 92: I just want the straight 4-1-1.

In phrases

give the four-eleven/411 (v.)

(US black) to give out information, to instruct; also as excl.

in Ryerson Review of Journalism 88: Phat story, girlfriend. And after that, more fly stuff when we bring the new ZBC go-go dancers out to give the 411 on our new sister station, ZBC Danceworld.
Teddy Williams ‘Where Are Blacks In L.A.?’ at 🌐 encourages users to provide feedback. Whether you want to promote your upcoming fundraiser, or just give the ‘411’ on where to get the best Jamaican jerk chicken, this is the place to voice your choice.
[US]D.H. Sterry Chicken (2003) 58: Mr. Hartley gives me the four-one-one. Then he’s gone.
[US] posting at 14 Oct. 🌐 Dish the dirt on that Dirty Rat! Give us the 411 on that fool.
JAAS XI–XII 1: We generally give the 411 on what is occurring at our places of employment.
[US]T. Robinson ‘Saint of Gunners’ in Dirty Words [ebook] ‘Ain’t no thang. Benji gave me the 411’.