A saying originating in New Zealand.
You would say it when someone or something is disorganized.
It references how cheap biscuit (Cookie) mixes can be messy and difficult to use.
when describing a female, means one of two things:
1. she's fat: literally popping out of her clothes
2. she's popping out in all the right places (t + a)
"whoa--look at that one over there"
"day-um! that shit is poppin' out all over the place!"