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."
by kindkid August 10, 2007
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