anti square
the opposite of a person who is regarded as dull, rigidly conventional, and out of touch with current trends.
fi fye fo tell i smell squares in here ...halt who goes there homeboy we anti-square - MAC DRE (ANTI SQUARE)
Anti Square Head Day
After the Gumby movie the creator said that a anti square head day on October 21s as made.
Person 1: "Its Anti Square Head Day!" Person 2: "Whats that?"