Crabby/ˈkræbi/ Definition 1 of 3Pro Tip 1/3Emotional Mood Used to describe someone's temporary mood, not their overall personality. She can be really friendly, just not today—she's feeling crabby. Pro Tip 2/3Not Serious Often not a deep feeling - might just be due to a minor annoyance. Missing his snack made him crabby, but he got over it quickly. Pro Tip 3/3Informal Speech More commonly used in casual conversation than formal writing. Sorry for being crabby earlier, didn't get much sleep.