Bajram Serif Mubarek Olsun svima basically means happy eid to everyone. It is also to commemorate the end of hajj. When someone says it to you, you are supposed to say Allah Razala.
What Does Bajram Serif Mubarek Olsun Svima Mean?
If you can give the source language, we will be able to provide the meaning. These words can be present in vaious languages and have slightly different meanings. Looks like this is indonesian?