אָלוּףaluf meaning in Hebrew
champ (lit. general, champion) · noun, used as a form of address

Your friend locked the keys in the car, and it is starting to rain. You just look at him and say one word: aluf.
שכחת את המפתחות בבית שוב? כל הכבוד, אלוף, באמת.
“Forgot your keys at home again? Well done, champ. Really.”
Who do you call aluf with a straight face right after he has done something hopeless?