spam in a can en · NOUN
Etymology
In reference to the tinned meat product called SPAM.
Meanings
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(derogatory, slang, uncountable) Astronauts whose mission involves confinement in a small space capsule.
The lab rat, experimental object, “Spam in a can” idea wasn't NASA's vision of the astronaut, but this unpleasant dimension of astronaut life did seep into spaces with a claim to public attention.
1998, Jodi Dean, Aliens in America, page 78:Many of the 324 candidates […] were convinced that astronauts were going to be “spam in a can,” mere passengers in a capsule controlled by NASA technicians on the ground.
2011, G. Scott Thomas, A New World to be Won, page 26: