It is commonly used, when you are obligated to help someone, or you find someone's performance is below standard, or dissatisfaction.
This can also be expressed as," Diu lay lo mo ah!" Which is the same but with the "ah!", it expresses a deeper meaning/feeling.
Phonetical pronunciation: "Delay no more"
Ed: Diu lay lo mo!
Jeff: dood, i always spot you with money!
Ed: Diu lay lo mo ah!