The milk is in the bag
The process of having your shit on lock, Having one or several situations under control.
"You got that stripper coming over?", "The milk is in the bag bro."
milk in a bag
In America milk comes in plastic containers. In Canada it comes in a bag.
Who used the last of the milk and didn't put in a new bag?
milk-in-a-bag
when milk is in a bag. but the bag becomes milky.
there is milk in this bag. therefor we call it, - milk-in-a-bag