I don't think I can find a precise translation of the Arabic word na'iman. It is what you say to someone after he/she had a new haircut, a shower or a bath. I don't actually think that other languages have special expressions to greet people coming out of the barbershop or the bathroom! Anyway... Na'im in Arabic is comfort or bliss, but the expression na'iman probably means something like "may it be a bliss for you". The response (of the one with the new haircut) would be: "Allah yen'am 'alek" - "May God bestow bliss upon you".