Wordnet 3.0
NOUN (1)
1. 
 the act of deluding; 
 deception by creating illusory ideas; 
[syn: delusion, illusion, head game]
WordNet (r) 3.0 (2006):
head game
    n 1: the act of deluding; deception by creating illusory ideas
         [syn: delusion, illusion, head game]