Uses it as a greeting when arriving at work in the same episode.
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The Macrodata Refinement (MDR) team finalizes their plan to "wake up" their innie identities in the outside world.
Irving references the joke again before leaving for the Waffle Party, saying, "Okay, kids. Let's find out what's for dinner". Episode Overview
The phrase "Hi kids, what's for dinner?" is a recurring joke and greeting used by various characters throughout the series:
Cobel is fired by the board for failing to report Helly's suicide attempt and for her unauthorized monitoring of Mark’s outie life.