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Apparently, Charter named his art work a "cryba" (in the vein of Ray's "moticos"?), writing out "Cryba By Weeks." So Ray used that term to make "Crybaby" Weeks. Charter then went on to use the phrase as his new nickname.
A Blog for the Exhibition, From BMC to NYC: The Tutelary Years of Ray Johnson (1943-1967) Black Mountain College Museum + Arts Center, Asheville NC