DULM full form

What does DULM mean or stand for ?

DULM is a phrase that is used online between two persons who are having a text based chat either on the computer or smartphone is generally used by young teens and adolescents as a sneaky way of asking the other how they feel.

Do you like me is a harmless phrase for flirting and also is a definite way of knowing if there any romantic interests from the other person.