All of these definition's say its either from Scotland or Northern Ireland but thats bullshit its from Dublin.
"Yer Ma" Is a phrase used as a comeback to ANYTHING.
It can be a part of a long insult(Ex.1) or just used as itself.(Ex. 2)
Person 1: Your a little virgin , fuck off.
Person 2: Thats not what yer ma was saying last night.
Irish equivalent of 'your mother', 'yo momma', 'ya mam', etc. Generally used as wonderfully nonsensical response to a question (especially a stupid one).
yer ma means your mother or mom or whatever you want it to be. I live in Scotland and these neds use this phrase to insult your female parent. They also use this phrase when talking to one another.
'whaaaaayyy yer ma has nae titties'
'is yer ma orite with us crashin at ur hoose'