Kie, I've been having fun with each of the poems in this series (which I'm enjoying immensely, by the way) -- first, reading them to see if I can figure out the slang by context and tone, and only then trying to look up the slang words on the internet to see if I'm right. (Generally I'm pleased to say I've been close enough.)
For your entertainment, I'm going to post my rough interpretation of this one without looking anything up -- mostly because it had more slang than usual that got me puzzling over more than one possible meaning, so I might be way off. If nothing else, it will entertain you.
Overall, it sounded to me like someone baiting a man about his wife with a string of insults. It could be another man trying to pick a fight, a nasty female acquaintance, or perhaps the man's mother (if she really dislikes her daughter-in-law). The comments about laundry and holes in the clothes seemed (if I may be sexist) most likely to come from a woman -- so I plunked down for either a hostile mother, or a nosy, bad-tempered female acquaintance.
Much depends on whether the "son" is to be taken literally or not, and whether or not "tapped" is a sexual reference. I'm going to go out on a limb and guess "yes" and "no" on those questions, and plunk down for a mother who is annoyed at hearing her son complain, and thinks her daughter-in-law is worthless.
Ych a fi! That girl of yours? Talk tidy, mun...
you're all jaw, you are, an' no balls.
You gob your bellyache an' blame it
on how you was rared, but I sees your missus,
a nutter if we're being reel, an' a notright
will need tapping, son...
There's no shape on 'er washing –
your boy's togs is full of holes, pooer dab,
do afto shift for 'imself! Now, see your rubbish?
So's I don't want it now, or again not –
go potch 'bout the ash, an' pit what
you haven't, all lovely like, 'till the trewth
comes calling where it rather won't be after.
Cass's attempt at interpretation:
Pfft! That wife of yours? Talk sense, man.
You're all mouth and no courage,
complaining all the time and blaming it
on how you were raised, but I see your wife --
who's a lunatic, if I'm going to be honest with you -- and a crazy person
needs to be locked up, son. [
"need tapping" had me puzzling more than most of the rest put together. I thought it could mean "needs sexual intercourse", or alternatively "needs to be beaten", but context-wise, this seemed more like what the narrator would likely be saying about the woman. Especially if "son" is taken literally, and not to mean, e.g., "man" or "friend."]
She's terrible at doing the laundry.
Your son's clothes are full of holes, poor kid.
and he has to do things for himself. Now, see what bullshit you're talking?
So I don't want to hear you complaining again, now or ever.
Go whine about garbage, or brag about
["ash" was another one I puzzled over. This seemed to make sense to me]
what you don't have, until the truth
catches up with you and you're forced to face it.