goffer, n. — Green’s Dictionary of Slang

goffer n.

[? fig. use of RN goffer, mineral water or lemonade, orig. that manufactured by Goffe & Sons Ltd. The image is of an angry person who is excited in the way that the bubbles in aerated water are. The mineral water use is extant in Aus. armed services]

a blow, a punch.

1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 106: ‘Goffer, I’ll Draw You Off A’: A form of challenge to an angry man. If met with the retort ‘Go on’, fisticuffs usually follow.
[1984		(con. WW2) T. Jones Heart of Oak [ebook] [The canteen] was usually crammed with a stock of nutty and DFs and ‘goffers’. There we bought our cigarette and sweet rations].