Definition & Meaning of "ass nibbler"in English

What is the origin of the term "ass nibbler" and how is it used?

Ass nibbler is a slang term that appeared in late 20th–early 21st-century English to describe an insignificant person who clumsily tries to win favor with others. The term combines "ass," implying subservience, with "nibbler," suggesting timid or ineffective action, literally portraying someone attempting to ingratiate themselves in a weak or awkward way. Historically, it was derogatory, used to mock or belittle sycophantic behavior, and today it remains informal and insulting, typically appearing in casual, critical, or humorous contexts rather than polite or neutral conversation.