From Longman Dictionary of Contemporary Englishchortlechor‧tle /ˈtʃɔːtl $ ˈtʃɔːrtl/ verb [intransitive] formal LAUGHto laugh because you are amused or pleased about something Harry chortled with delight. —chortle noun [countable]→ See Verb table
Examples from the Corpus
chortle• But now I can emit a genuine chortle.• I tried to wait, expecting him to respond with a gurgle or a chortle.• He chortled and opened the door.• A few of the Dorcas gang chortled appreciatively.• Sharon is still chortling over that stupid joke.Origin chortle (1800-1900) chuckle + snort 