An acronym for "Dad I'd Like to F***". A dilf is any man (typically between the ages of 30-50) who is incredibly attractive and has kids. They are usually really cut, from activities such as pushing strollers, giving piggyback rides, and intense trips to the local park or Disney World. They also have a killer smile and sense of childlike joy, because they play with their kids all the time. Unfortunately, getting with them is hard, as they are typically very faithful to their wife (see MILF).
Girl #1: Did you see that guy with the stroller over there? He's a total dilf!
Girl #2: Yeah, but don't go up and flirt with him. That woman with him is probably his wife.