Salam - Hey/ Hello.
Labass/ bekher? - How are you doing? (you may answer hamdoulillah - thanks God everything is ok)
Kolshi mziane? - is everything ok? (you may answer "kolshi mziane":) )
B'slama - good bye
B'saha- a very grateful phrase which is said when you buy something new, when you get a gift, when you eat and even when you take a shower. It is pretty hard to find an equivalent in any other language. It means something like "na zdrowie" in Polish, "a votre sante" in French. In English it is something like "enjoy your purchase/ meal/ whatever". The answer to this is Laatek saha. Meaning more or less "the same for you" or "bless you"
Shoukran bzaff- Thanks a lot (bzaff means "a lot")
Shwiya- a little bit
Zouin/zouina- beautiful or nice (male/female). Tourists will hear it a lot:) get used to, brace yourselves! It can be said about anything.. weather, clothes, city...
Wakha- OK/ deal/ I agree
Sir bhalek- go away. When someone pisses you off you may say that with no regrets. For more "advanced" curses.. Hit the button "message" on Facebook and don't hesitate to ask:)

Except all the phrases above you'll often hear "khouya" or "sahbi" which means something like "brother". Moroccans abuse this word (in the positive sense). Whenever you go shopping, eating out etc you will hear it many times per day:)

and the immortal, constantly used "inshallah"- literally "if God wills". We may translate it as "hopefully" or "I hope".