Definition & Meaning of "blow me"in English

What is the origin of the term "blow me" and how is it used?

"Blow me" is a slang expression of contempt, defiance, or dismissal that appeared in British English in the early to mid-20th century. It is a shortened, crude version of telling someone to perform oral sex, used figuratively to reject, insult, or provoke them. The phrase is used mainly in informal, confrontational, or humorous contexts, often among peers. It is vulgar and offensive, never neutral, and generally inappropriate in polite or formal conversation.