What a bummer!!!

I Just have learned a new expresion! "What a bummer!" it can be a slang or phrase ? I dont know .just want to use it ! the internet was not working well ,so weird .we had a trial session today .we tried to connect for several time ,they tured out bad , gosh !what a bummer !! I didnt know that express then but i could guess! what a great job i did!! Lol!

Hi, the phrase "what a bummer" is used to express diappointment at he outcome of something.  This phrase, I guess, is still used by people but I think it would be considered outdated. This was a popular phrase back in the 1960's and 1970's.

I guess you can still use it but it sounds a little outdated.

The thing is , I can't think of better replacement for it or another good colloquial way to express disappoinyment! Maybe that's why it is still is popular use!