noun Definition of pbkac in Technology (humour) (Or "PEBKAC", "PBCAK", "PBKAC") Tech support shorthand for "Problem (Exists) between Chair and Keyboard". An alternative is "PICNIC" - "Problem In Chair, Not In Computer". An acronym commonly used by helpdesk technicians to indicate that a problem is due to the user rather than the system. See also UBD. 1
