‘Dar mole’ means to not give resistance to something, frequently used to refer to social situations when a woman is being receptive to a man in a bar, etc. Basically, it means when a woman is into a guy. Can a guy dar mole to a woman? Sure, but I think it occurs according to the second definition that follows. The term ‘dar mole’ can also be used in the sense of not being alert to something in a situation where you can be taken advantage of or where you can ‘lose face’.
Here’s an exageration on what it means to “dar mole” (first definition).