An indefinable swear/cuss, it possesses no real meaning or sense.
Can be shouted on all occasions and in all places, such as work, school lessons, college lessons, church, during sex, at a funeral and even while having sex in a church.
'Dude, you're a bad mother Hubberd'
'Get over here you mother hubberd'
'Hey! shop touching my mother hubberds you skanky piece of mother hubberd'