Imitative term to describe a reserved, middle of the road type of laughter. Originated in the days before the internet on a BBS to represent how Beavis laughed on Beavis and Butt-Head. "huhu" was also used for Butt-head but did not catch on.
Also: hehehe, heh

nervous laugh- to laugh nervously, worried chuckle

a response to something funny, but not quite as funny to deserve a 'lol' or 'lmao'

A signature giggle used by Viorica Dancila, first female prime minister of Romania, caused by emotions and being unfit, untrained or unprepared for a diplomatic meeting.

This became a meme in Romania.

i'm laughting; that was funny; synonym to LOL; all your base.

A word when you find something funny or have absolutely no idea what’s going on in the conversation it’s an easy cop out