One who talks out of one's ass by speaking without true or accurate knowledge of the subject.
The real estate agent proved to be a rectal rambler when she explained that the water line visible on the white enamel washing machine was caused by water wicking instead of being evidence of basement flooding.
Alex The Rambler is a British You tuber who is best know for playing the grand strategy game Hoi4 (Hearts of Iron 4). His friend are isorrowproductions, Feedback Gaming, Rimmy Downunder Gaming, and The Spiffing Brit. His current lover is Drew Durnil gay.
Guy one: Hey did you hear Alex The Rambler is quieting Hoi4?
Guy two: Who, what?