It's pronounced titdallal (masculine singular) or titdallaleen (feminine singular).
It comes from the concept of دلال, which is when you know someone cares about you a lot and loves you enough that they allow you to indulge. You say someone is مدلل when his parents (or others) indulge his every request. This is opposed to مدلّع which means spoilt, or someone that takes advantage of such دلال that they become rude, self centred, and entitled.
I wasn't able to find a recording for the word in this exact sense, but I do remember an old song where the singer says it in the imperative to the one he loves اتدلل, basically telling her to go ahead and ask whatever she wants because he will do whatever she asks. You'll find the word at 1:26 on this website: اغنية تدلل عيني. It's a free website so I don't think that you'll have trouble reaching it.