Green’s Dictionary of Slang

lay on v.

1. (also lay) to give, e.g. money, drugs.

[Aus]Bulletin (Sydney) 1 Aug. 9/1: Mr. Thornton’s performance [...] is quite inimitable. You can believe this. Though, having a heart about the size of a bank-clerk’s lunch, we have acquired somewhat a reputation for ‘laying on the raspberry.’.
[US]D. Runyon ‘A Very Honorable Guy’ in Runyon on Broadway (1954) 418: She says she will give me the wind if I do not lay something on the line.
[US]Mezzrow & Wolfe Really the Blues 4: Old Lady Fortune sure laid it on me when she handed me that tinny old sax.
[US]W. Burroughs Naked Lunch (1968) 182: Laid ten pieces of H on her.
[US]Rigney & Smith Real Bohemia xv: lay on, to to give a gift.
[US]H.S. Thompson Hell’s Angels (1967) 61: Then I pick up a couple of guys, lay a few bucks on ’em for the help, then we go out to see the punk.
[US]D. Goines Inner City Hoodlum 35: A means of laying some money on his parents.
[US]J. Ellroy Brown’s Requiem 192: Tell him Fritz Brown said for him to lay a grand on you.
[US]N. McCall Makes Me Wanna Holler (1995) 144: He was going to lay some heavy time on me.
[UK]N. Griffiths Grits 343: Now if a laid oner these [i.e. a depressant] on yew, yurd be flat out in twenty minutes.
[Aus]J.J. DeCeglie Drawing Dead [ebook] The first wad her old man had laid on me I gave mostly to her.

2. to tell, to impose facts upon.

[US]J. Harrison ‘Negro English’ in Anglia VII 273: To lay sump’n’ on somebody = to accuse some one.
[Aus]Bulletin (Sydney) 29 Aug. 12/4: Harry Levien, M.L.A., [...] is now haunted in his business and his leisure hours by hair-lipped and fur-capped chents, who request (confidentially) to be ‘laid on.’ ‘If it’s as big as you pitch it is, Harry,’ said Boss-eyed Melchisedech, ‘you can bet the fust lot ain’t cleared out half the stuff.’.
[Aus]J. Furphy Such is Life 35: It is a good idea. [...] I’m glad you laid me on to it.
[US]H.C. Witwer Fighting Blood 228: He claims he feels more or less responsible for me going to the cleaners, as his son laid me on the horse.
[Aus]Advocate (Burnie, Tas.) 28 Oct. 6/5: Horton said, ‘You have been laid on to this,’ and Stokes said, ‘Yes, who potted us?’.
[US]Louis Jordan ‘You Run Your Mouth and I’ll Run My Business’ [lyrics] But dig this spiel I’m going to lay on you, gate, / Don’t cop your broom, park the body and wait.
[US]D. Wallop Night Light 200: Laying a story on me.
[US]W. Motley Let No Man Write My Epitaph (1960) 248: I’m the lead man. I lay on the jive and Billy fills his pockets.
[Aus]T. Ronan Only a Short Walk 28: I heard down town that Shanghai Pete is opening up again [...] I ought to lay Brownie on to that.
[US]G.V. Higgins Friends of Eddie Coyle (1973) 29: Let me lay it right on you [...] I don’t honestly know any more.
[UK]F. Taylor Auf Wiedersehen Pet Two 97: ‘Oh, don’t lay that on us!’ Oz protested.
[US]S. Morgan Homeboy 195: What kind of note you layin on me? What’s the game?
[UK]T. Blacker Kill Your Darlings 281: What kind of scumbag woud I be to lay the guilt on her?

3. (Aus.) to assail.

[Aus]Bulletin (Sydney) 2 Aug. 16/2: He is dogged and waylaid and variously persecuted at every turn; and while innocently boiling his billy under a gumtree he is suddenly surprised by a rush of bobbies, ‘laid on’ by idiotic residents, who cover him with guns and roar at him to ‘bail up.’.

4. (Aus und.) to provide a victim for a thief or confidence trickster.

[Aus]Truth (Brisbane) 12 Apr. 9/3: But the wust of all them pushers / Are the kinchin buttoners / Who goes trailin round the streets / [...] / For to lay the magsman on, or / Burrow out a easey mug.

In phrases

lay on a burn (v.) [burn v. (1)]

(US black) to infect someone with a sexually transmitted disease intentionally.

[US]Ebonics Primer at [Internet] lay on a burn Definition: to give someone a sexually transmitted disease on purpose. Example: I’m bout to lay on a burn to this beyotch so she’ll lay off ma back.