Contrary to popular beleif the term 'yer ma' doesn't actually originate in Scotland. It has been used by many 'spides' or 'steeks' in the beautiful county of Northern Ireland for many many years. As stated above, it is used in a vulgar way when in an argument, when the spide/steek can't think of anything else to say.
Generally it is used to imply that that the spide/steek has had sexual relations with one's mother... but it is usually not the case, since most spides/steeks couldn't get laid if they tried.
"I had yer ma last neet so ah did!"
by Gareth January 9, 2004
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Your mother: (East coast Scotland or Irish spelling)Default insult in a slagging contest. Primarily used when all other insults available have been exhausted. Statement to falsify outrageous claims made by a certain individual or party. Also see Yer Maw!
Ross: "I banged Kylie Minogue last night so I did!"
Ally: "YER MA!"
by Mr f gibble August 14, 2015
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spide slag for when they can't think of anything else to say better than it
"yer ma luvs it"
"yer ma luvs the beef"
"yer ma wasnt sayin that last neet"
"Lest neet, I wiz ebsalutely balleexed"
by yourmalovesitupthearse May 5, 2005
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"Yer ma" is used by people in Northern Ireland or norn iron as an insult to someone.

Bob "Hey doing anything tonight?"

Eoin "I'm doin yer ma!"

Bob "Shut up here tell yer ma that my names Bob not Harder cause thats what she was screaming to me last night!"
by nang nang April 15, 2008
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wen ppl hav nothin better 2 offend ppl, they refer 2 'yer ma' meaning your mam, they are trying to say they have shagged her basically
george:your crap at singing!
freddy: yer ma's crap! (aka : in bed)
by geordie March 10, 2005
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"yer ma" is a generic response when you can't think of anything else to say. Mostly used in Scotland, and by yer ma (see...)
"What are you doing?" "yer ma"
"Fancy a drink?" "No, I fancy yer ma"
etc...
by yer ma (obviously) January 1, 2005
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Yer ma is an insult often used by "mokes", "steeks", "spides" and "millies".

Basically it means your mother, often return firing an insult, or saying I had (slept) with your mother.

Return fire with something like "You did mate.. I would seriously consider visiting a doctor about that, coulda caught something" "What would you rate her? 8 out of 10? She's good isn't she?" "My "You dug her up from the ground you sick bastard?!" "She's dead" (I hate this one..) "She's had a lot of people you know."
"AHhh You're crap!"
"Ay yer ma!

(Listen to my audio definition.. it's of how a steek would pronounce it)
by Conor July 2, 2004
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