1. A psuedonym for a chick so hot that she causes you to have an erection; ie, causes your dick to be "dublin."
2. A pick-up line. (See below)
3. Opposite of "nubblin," which is a chick so ugly that she causes shrinkage, or makes your junk turtle.
At the bar: "Hey baby, you must be from Ireland, 'cause you're so fine, I'm dublin."