Tailpipe (DOTM)

Cliffjumper wants to go out and bend some tailpipes. Translation: Tailpipe means embarrassing figurative anatomy.

Also, in Beast Wars, when Rattrap suggests that Silverbolt lighten up, he mentions removing a broomstick from the aforementioned part of the anatomy. It is possibly another term for one's exhaust port.

Classics

Cliffjumper's Classics toy motto says so.

From Teletraan I: The Transformers Wiki, a Wikia wiki.