According to wikipedia,

Ah beng is a stereotype applied to a certain of a group of young Chinese men in Southeast Asia, particularly Singapore and Malaysia. The stereotypical view of a Ah Beng is a young Chinese man or teenager, that lacks cultural refinement or indulging in criminal activity or being involved in brawling or arguing out of disagreements with other people. Ah Bengs are also sometimes associated with extensively-modified or zhng-ed cars,and are stereotypically seen as being excessively flashy and show-offs.

In Malaysia, the term 'Ah Beng' usually refers to males who have unusual styles and tastes. And the term 'lala-zai' refers to males involved in stereotypical gangster activity or fashion such as the dyeing of hair.

Yeah,
My nickname is ah beng,
but I'm here to tell u that,
Im the ah beng that lack of all these "features", lolx

Let see, this is ah beng's style.