Short for "Business Casual Friday". Some places of business relax their normal dress code policy for employees on Friday. Bizcasfri refers to this slightly-more-relaxed style, or the day itself in such a work environment.
"That's like the fourth meeting this week and it's only Monday! Sheesh. I'm so wearing bizcasfri tomorrow."
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Strongbad: "...Then there's Business Casual Fridays, or as we say around the office, Biz Cas Fri. You know... because we have to abbreve everything. That's the day we all wear the free polo shirts we got from various software companies."
It's a shortened version of Business Casual Friday and it is when an office puts a policy in place where the workers can dress casual ie. jeans or shorts and t-shirt.
Did you see that guy who showed up on Biz-cash-fri wearing cargo shorts and a Hawaiian shirt?