DCHP-1 Online
hee-hee ((1)) [< Chinook Jargon] 
n. laughter; fun.
- 1884 (1926) In the afternoon bayou hihi [much merriment].
- 1894 ". . . Where are you going to--the hee-hee house?" "No, no. Hee-hee house no good. No makee money there. Pay all the time. Me go gamble."
- 1884 (1926) In the afternoon bayou hihi [much merriment].