Green’s Dictionary of Slang

muz v.2

also muzz
[dial. muzzle, to drink to excess, to make drunk]

to render ‘muzzy’, to bemuse, usu. through drink.

[UK]‘Anthony Pasquin’ Shrove Tuesday 26: When the nocturnal orgie’d muzz’d his brain.
[UK]P. Egan Key to the Picture of the Fancy going to a Fight 11: The Daffies, when assembled, generally drink together [...] it is a singular circumstance indeed, if a Daffyonian is necessitated to muz solus.
[UK]Sat. Rev. (London) 17 June 727/1: A certain judge was in the habit of muzzing himself by plenteous libations .
[US]H. Bradshaw letter in Prothero Memoir (1888) 259: With a very heavy cold on me, which muzzed my head [...] I have been very far from comfortable.
[UK]A. Quiller-Couch True Tilda 281: Mother says it comes of muzzing my head with books and then putting two and two together and making ’em five.
G. Black Bitter Tea 165: Drugs don’t seem to have muzzed you.

In derivatives

muzzed (adj.)

tipsy, befuddled by drink.

[UK]F. Pilon He Would be a Soldier VI i: And a choice companion he is; only apt to get muzz’d too soon.
J. Woodforde Diary of Country Parson 14 Jan. (1927) III 3: He returned about 3 o’clock, quite muzzed by Liquor.
[UK]C. Dibdin Yngr Song Smith 84: Thus Britons doat on being muzz’d.
[UK] ‘The Birth &c. of Mister Murphy McClahan’ Universal Songster I 38: With the whiskey half-muzzed.
[UK]Comic Almanack Mar. 48: While Harlequin half-muzz’d with wine, / Don’t care a rush of Columbine.