Green’s Dictionary of Slang

lay v.4

(US black) an all-purpose v. of action.

D. Burley N.Y. Amsterdam Star-News 5 July 13: ‘Lay’ [...] denotes action and can be made to do many things [...] in Jive talking.
[US]D. Burley Orig. Hbk of Harlem Jive 142: Lay — put down, speak, walk, hide, give, ask, exhibit.
[US]A. Anderson ‘Blueplate Special’ in Lover Man 127: ‘Aw, maaaaan,’ I says, ‘don’t be laying that jive on me. You know better than that.’.
[US]J. Mills Panic in Needle Park (1971) 168: She’ll go away a long, long, long time. ’Cause you know she’s got this three-year SS from the last time and like they’ll lay that on her too.
[US]P. Thomas Down These Mean Streets (1970) 5: One of the cats took his belt off, and this brought a twinge of memory of what Poppa had laid on me earlier.
[US]B. Jackson Get Your Ass in the Water (1974) 59: I don’t care where you goin’ and where you’ve been [...] / I’m layin’ to wrap this good hot juicy pussy all around your badass chin.
[UK]R. Hewitt White Talk Black Talk 121: Jes’ a-lay some jump an’ bass.

In phrases

lay it (v.) [note Lincoln University (Oxford, Pennsylvania) use c.1934: ‘lay it. To do something extremely well’]

(US) to do something in a noteworthy manner, e.g. to play jazz music well.

[US] ‘Hectic Harlem’ in N.Y. Amsterdam News 8 Feb. sect. 2: LAYIN’ IT STIFF AND STOUT. – Same as HIGH LIVING, q.v.
[US]Lil Johnson ‘Winner Joe’ 🎵 But he always had that killing blow, / Every since he was a boy. / So, lay it, Joe! / You got the best blow!
[US]D. Burley Orig. Hbk of Harlem Jive 78: If he says, ‘he is really laying it,’ he means someone was doing something out of the ordinary as in a stage performance or musical program, or a well-dressed person entering a room and suddenly becoming the object of all eyes.
[US]J. Sayles Union Dues (1978) 194: Pick it, Billy, lay it down!
lay with (v.)

(US black) to remain with, stick to.

[US]R. Woodley Dealer 10: Slick and me started on reefer, and I went to coke and he went to scag. Scag is where the most money is. But me, I laid with the other two.

In exclamations