What does al walf s3ib mean? thanks in advance! 
Al walf s3ib : It’s hard to get used to someone/something.
Al walf comes from the verb wellef : to get used (to).
Al walf s3ib doesn’t mean that it’s the process of getting used to someone that is hard, but rather what might come after: separation. So when you are separated from someone, you’d say -or you’d be told-: Al walf s3ib, meaning that getting used to someone in your life makes it hard for you to get apart from them.
oh interesting thanks! 
You are welcome.