Green’s Dictionary of Slang

pap n.3

deceit, distastefulness; empty verbiage.

[UK]D. Cotsford Society Snapshots 68: So if he we find here pruriency or ‘pap,’ / Our patronage denied is — verbum sap.
[US](con. 1962) J. Ellroy Enchanters 133: We [...] dispensed backslaps and Freddy’s-the-Man pap.

In phrases

give pap (v.)

(UK Und.) to trick with the intention of causing harm.

[UK]‘T.B. Junr.’ Pettyfogger Dramatized II i: I must do up Old Crazy, the landlord, and his neighbour. I’ve been giving them papp for some time. [Ibid.] 109: To Give Pap. To inveigle, with a view to destroy.
pap with a hatchet (n.) [SE pap, baby food; thus one feeds the baby (a kindness) with a hatchet (a cruelty)]

a kind act performed in an unkind manner, the act of being ‘cruel to be kind’.

[UK]Lyly [title] Pappe with an Hatchet.
[UK]G. Harvey Pierce’s Supererogation 70: Would God, Lilly had alwaies bene Euphues, and neuer Pap-hatchet; that old acquaintance [...] is neither lullabied with thy sweete Papp, nor scarre-crowed with thy sower hatchet.
[UK]Lyly Mother Bombie I iii: They give us pap with a spoone before we can speake, and when we speake for that wee love, pap with a hatchet.
[UK] in A. Niccholes Discourse of Marriage and Wiving 30: He that so old seekes for a nurse so yong, shall haue pap with a Hatchet for his comfort.
[UK]Tom Nash his Ghost [title] Written by Thomas Nash his Ghost, with Pap with a Hatchet, [...] when Martin Mar-Prelate was as mad as any of his Tub-men are now.
[UK] in D’Urfey Pills to Purge Melancholy IV 329: A Custard was to him Pap with a Hatchet.