Smile ~ what do you mean ~

Smile happily is a compound adjective.

Laughter refers to a person's facial expressions and actions caused by happiness and excitement.

Hee hee is used to modify the time of laughter. Hee hee is the sound of time and the sound made by the mouth when laughing. But it doesn't mean laughing, smirking, smirking, etc.

The word smile happily is more about women.