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Someone who is missing out on an activity everyone else is enjoying and/or being a debbie downer.

-Derived from drug culture, someone who would buy a tab/square of LSD that was skipped over by the dropper used to apply the drug onto it. Therefore that person is missing out while their friends are tripping.
"Last week John acted like a total skip square at the party, standing by himself while everyone else was chillin'"
"You hear about Brandon buying a sheet of blank paper thinking it was acid? lmao what a skip square"
by TophatDemon June 13, 2018
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