Think of it like a combination of a chuckle and a snort, a laugh that is both boisterous and slightly mischievous.
Here are some synonyms for "chortle":
* Chuckle
* Giggle
* Snicker
* Roar with laughter
* Laugh heartily
Here's an example of "chortle" used in a sentence:
"The old man chortled with delight as he watched the children play in the park."