We know because the Oxford English Dictionary added the word to its manuscript. It describes hangry as “bad-tempered or irritable as a result of hunger.”
Apparently, not eating for a while, lowers your blood sugar and all your hormones escape into wildness! You do and say things you wouldn’t ordinarily do. Researchers suggest you carry high protein snacks with you and nibble as necessary, but in Jonathan’s case, a little honey did the trick.
The Israelites were in distress that day, because Saul had bound the people under an oath, saying, “Cursed be anyone who eats food before evening comes, before I have avenged myself on my enemies!” So, none of the troops tasted food.
The entire army entered the woods, and there was honey on the ground. They saw the honey oozing out; yet no one put his hand to his mouth, because they feared the oath. 27 But Jonathan had not heard that his father had bound the people with the oath, so he reached out the end of the staff and dipped it into the honeycomb. His eyes brightened. One of the soldiers told him, “Your father bound the army under a strict oath, saying, ‘Cursed be anyone who eats food today!’ That is why the men are faint.”
Jonathan said, “My father has made trouble for the country. See how my eyes brightened when I tasted a little of this honey. How much better it would have been if the men had eaten today. (From 1 Samuel 14)
Yes, hangry is a thing. Be prepared to fight it with prayer and common sense.