"Kidding!” (3)
(Other definitions for not that I've seen before include "It negates a word" , "logically, operation needed" , "A negative word" , "Word of negation" , "Word of denial" .)
(Other definitions for psych that I've seen before include "To subject to mind games" , "Stimulate" , "Mind doctor (colloquial abbreviation)" , "Intimidate someone by making him feel uneasy" .)