Hangry
Etymology
A blend (a "portmanteau") of "hungry" and "angry." Isolated jokey uses appear as far back as the early twentieth century, but the word only caught on in the internet era, and was added to the Oxford English Dictionary in 2018. It is a genuine modern coinage rather than an inherited folk word — though the feeling it names is presumably ancient.
adjective · /HANG-gree/
Irritable or short-tempered specifically because you are hungry.
What it names
A precise handle for a real and common cause of a bad mood — reach for it when someone’s snappishness is a blood-sugar problem, not a character one.
Example
Can we stop for a sandwich before the meeting? I get hangry, and nobody wants that version of me negotiating.
Related idea
Peckish names mild early hunger with no mood attached; hangry names the point where hunger has curdled into temper.