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One who can not keep a secret.
AJ Green is a gizzer
by Ghetto Fabulous March 08, 2003
Someone is old; frequently used to describe forgetfulness, or physical impairment because of age; a verbal jab used to denote extreme age and it's impairments.
You big gizzer, can't you hack it? Need a cane?
by Art Brazee October 04, 2004