I have a growing agitation for when people use cause in the place of because. If you're going to try to be grammatically correct with your written slang, I feel like it would only be appropriate to take the extra effort to add the apostrophe in front of the word you're attempting to use. Otherwise your sentence makes no sense. Cause and 'cause have two completely different meanings. You do not look any more intelligent using "cause" instead of "cuz" as a subordinating conjunction.