Professional has to do with what a person does for work (example: a professional writer vs. someone who writes just for fun), though it can have an understanding of being as good as someone who does this as a job. I am guessing you meant "proficient", which means to be good at it and know what you are doing. cuz: This is generally understood, though is technically improper English and highly informal (it is something usually only seen in chat rooms or text messages). It is a shortened form of the informal (and also improper) 'cause (which is different from "cause", as in "cause and effect". Note the apostrophe at the beginning), which is a shortening of the proper form:"because". I recommend using "because" as it is most proper and does not seem sloppy or lazy like "cuz" does. Stuff written in blue represents an interpretation of what I think you meant. In regard to saying "males" and "females", though correct to say it this way, it can sound a bit awkward at times. More often, I think it is better to say "men" instead of "males" or "women" instead of "females", though "males" and "females" is more inclusive in terms of age than "men" and "women" is.