Boron compressor

A boron compressor is a component of at least some Generation 1 Transformer bodies.

In one instance, after failing a mission, Starscream attempted to explain himself: "We were brilliant in battle, Megatron. The Dinobots overwhelmed us with sheer brute force!" Megatron dismisses this excuse, exclaiming, "Brilliant, my boron compressor!"

Although the compressor's physiological purpose is unknown -- aside from compressing boron -- it clearly serves an additional metaphorical purpose familiar to speakers of English.

Footnotes

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