Something better left alone where one thing leads to another resulting in disaster, like the thread of a sweater that when pulled unravels the whole garment.
A person( usually female) who wears fashionable sweaters, or clothing and looks like what your typical stereotypical mother would look like. They usually act a Motherly fashion and are very classy.
Dan : "Hey Abbie, how's the workout going?"
Abbie : "Yeah, really great thanks. I'm sweating like a fat bird, in a bin bag, at a barn dance!"
Dan : "Good work, you won't be a fat fucker for much longer!"