Boron compressor
From MediaWiki
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!"[1]
Although the compressor's physiological purpose is unknown -- aside from compressing boron -- it clearly serves an additional metaphorical purpose familiar to speakers of English.

