Don't have to time to look at the poem, but going only from the title, so I may be way off, I'd say this is a Britishism and slang/informal.
"minging" means foul-smelling and by extension very bad or unpleasant more generally. You can also extapolate to "minger" (a very unattractive person), and, I guess, to the verb "to ming", as in "that bloater paste really mings" (I'm guessing does too).
The OED gives the origin of "minging" as "perhaps from Scots dialect ming ‘excrement’."
Matt
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