A boy who is extremely immature compared to his age.
Dickwanker's usually are seen in large groups who never leave eachother's sides and think they are "the shit" when infact they are not.
Dickwanker's usually take the term "bromance" too far hence the term "Dickwanker"
*Boy walks passed*
Girl 1: I've never seen a bigger dickwanker in my whole entire life
Girl 2: What about your ex?
Girl 1: Yes, he was a pretty big dickwanker