OK, THIS WORD MEANS that you are so beautiful.
Don't take care of YAMBOU, it is spelled ya boo, boo is in Arabic the father or the origin, ZINK is your beauty.
So when a person says this full phrase, that means he wants to say that you are very beautiful.
However when we say ONLY YAMBOU, SO THIS IS A BAD WORD which means insulation of yourself or your family.
LIKE THIS: YAMBOU + PERSON NAME.