psych
interj.— «psych (pronounced sy-y-y-k) an exclamation, means telling a lie. “Robert said Michael Jordan was his dad and then I yelled, ‘Psych! Psych!’”» —“L.A. Speak” by Kathleen Moloney, Mary McNamara Los Angeles Times Apr. 26, 1992. (source: Double-Tongued Dictionary)