When to say "Aşk olsun"

AŞK OLSUN ! 

aşk : love
olsun : may it be
So what does "may it be love" mean as a phrase, when to say it ?

1) It was a greeeting phrase in some cults, especially in Mevlevi and Bektaşi Orders. It was used to say "Hoşgeldin/Welcome" and "Afiyet olsun/Enjoy your meal".


2) People can say it when they really appreciate an attitude or a behavior and want to show their admire with a word that can worth more than a usual "aferin/good for you" but with "well done!, nicely done!" instead. But this is not so common. Today people usually say "bravo" or "helal olsun/may it be halal" instead of "aşk olsun", to show that they are impressed by the success or the good attitude they see.

3) The last and the most common use is when you show your disapproval, criticism or just a reproach to your friend; like saying "shame on you!, you should be embarrassed!"

It does not need to be that critical or judgemental all the time.
Let's say you wanted your friend to do a favor for you. You help him whenever he needs, and now you need help but he just refused you with an excuse. Then you can say "Aşk olsun" with a reproachful voice.
Your friend thought that you forgot her birthday and shared this opinion with you. Then you can reply "Aşk olsun, nasıl düşünürsün bunu, asla unutmam/how can you think of that, I never forget it"
As you see it is not like saying shame on you but just reproaching.
Well, if someone has done something which you can never forgive, again you can say "Aşk olsun sana, bir daha benle konuşma/Shame on you! Do not ever talk to me again" Now you say it with a high disapproval.

I hope you will not need it as in the last example. Otherwise it is already not so bad.