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A catalina cow is a girl who attends Santa Catalina School.
Originally was a derogatory term from rival schools (who will not be named), but was then adopted by the catalina cows themselves as a fun loving joke poking fun at themselves.

Stevenson Girl: ooh, look at the cows! moooo!
Catalina Cows: *walks on all fours mooing* thats right bitches!!
by CatalinaCow February 21, 2008