Great stuff from Intercultural Training:
Inshaalah is a phrase that Muslims and Arabs will use frequently, and it reflects deep-rooted beliefs on pre-destination and fatalism. Literally translated, Inshaalah means God willing. Taken in its everyday use, or abuse, it could mean yes, or no, and it could mean leave it with me, can we talk about this on another occasion or please drop the subject. It is a highly contextual phrase, and its precise meaning will depend on the request or issue being discussed, the relationships, power distance, and naturally body language and intonation. It is thus no wonder that it defeats most newcomers!
It made me laugh! But very insightful and true :-)
