Call me big brother.

The source of terrier is mainly with a certain sense of humor and self-mockery. In real life, big brother refers to people who are older than themselves and a generation older than themselves. The middle comb is a common hairstyle.

When a man with a flat head says, "Call me Big Brother, and I'll teach you how to comb your hair," he is mocking himself that his hairstyle is flat head, hoping that others will call him Big Brother, thus gaining some satisfaction in words. With a certain sense of humor, people with flat heads don't leave their hair in the middle, which means some teasing and banter.