be there and be square en · X
Etymology
From the phrase be there or be square. Originally from The Simpsons episode Mayored to the Mob, aired in 1998.
Meanings
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(humorous, slang) Used to encourage someone to visit a place typically associated with niche or intellectually focused interests.
All nerds welcome. Be there... and be square.
2000, Network World, volume 17, number 40, page 74: