a maw
A maw is a fancy Scottish way of saying 'your mom', like when someone insults you and you go 'your mom' back at them, but with more attitude and less effort.
'You're the worst friend ever!' 'Aye, yer maw!'
'I failed my math test!' 'Aye, yer maw!'
'You broke my phone!' 'Aye, yer maw!'