Green’s Dictionary of Slang

muns n.

also munds, munns
[dial. mun, the face; thus mid-19C street cry ‘One a penny, two a penny, hot cross buns, / Butter them and sugar them and put them in your muns’; Grose (1785) traces it to Ger. mund, mouth]

1. the mouth, the jaws, the face, the lips.

[UK]Head Eng. Rogue I 50: Munns, The Face.
[UK]Head Canting Academy (2nd edn).
[UK]B.E. Dict. Canting Crew n.p.: Muns c. the Face. Toute his Muns, c. note well his Phis, or mark his Face well.
[UK]J. Shirley Triumph of Wit 195: Tout thro’ the Wicker, and see where the Gully pikes with the Gentry-mort, whose Muns is the rummest I ever touched before [Look thro’ the Window, and see where the Man walks with the Gentlewoman, whose Face is the best I ever saw before].
[UK]J. Dalton Narrative of Street-Robberies 14: She [...] call’d out furiously, Stop Thief; whereupon they cross’d the Way, that she should not have an Opportunity to rap their Muns.
[UK]J. Poulter Discoveries (1774) 43: Chive his Muns; cut his Face.
[UK]Foote The Minor 39: Why, you jade, you look as rosy this morning, I must have a smack at your muns.
[UK]G. Parker Life’s Painter 139: The first thing that was done, sir, / Was handling round the kid, / That all might smack his muns, sir.
[UK]C. Dibdin ‘Dicky Ditto’ Buck’s Delight 74: Noodle, nooble, ugly muns!
[UK]G. Andrewes Dict. Sl. and Cant.
N.Y. Morning Post 3 Apr. 2/4: An honest Hibernian standing hard by, [...] gave poor Cato such a dig in his munns, that he was no longer able to tell what he wanted.
[UK]T. Moore ‘The Milling Match’ in Farmer Musa Pedestris (1896) 87: His faithful pals the done-up Dares bore / Back to his home with tottering gams, sunk heart, / And muns and noddle pink’d in every part.
[UK]Lytton Pelham III 291: Ah, Bess, my covess, strike me blind if my sees don’t tout your bingo muns in spite of the darkmans.
[UK] ‘Her Muns with a Grin’ Swell!!! or, Slap-Up Chaunter 50: Her muns vith a grin, vhich no velvet could vin.
[UK]‘May Day Morning’ in Capt. Morris’s Songs in Spedding & Watt (eds) Bawdy Songbooks (2011) III 222: Then Moll she began for to row, / And a lick in the muns gave him warning.
[UK]Flash Dict. in Sinks of London Laid Open.
[UK]Hotten Dict. of Modern Sl. etc.
[UK]Hotten Sl. Dict.

2. in ext. use, the whole person.

[UK]Bloody Register III 169: Jenny [...] gives the hint to her companions to bulk the Muns forward (that is, push).

In phrases

rum muns (n.)

a handsome man.

[UK] Ordinary of Newgate Account 18 Mar. [Internet] She observ’d a Gentleman who was a very Rum Muns, (that is, a great Beau).