What is Yer Ma!?
1.
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)
See
2.
variation of the common insult "your mom" or "yo mamma." this variation is one of the rednecks. introduced to society by harrison.
Harrison: yeeehaw! i rode dem horses harrrrrrd last night!
Victim: YER MA!
See