Meaning

noun a foolish or nervous laugh

verb laugh nervously

originEarly 16th century, probably of imitative origin. Or, perhaps a frequentative based on dialectal English gig (“to creak”), from Middle English gigen (“to make a creaking sound”) + -le; or perhaps of Dutch or Low German origin: compare Saterland Frisian güüchelje (“to giggle”), West Frisian giechelje (“to giggle”), Dutch giechelen (“to giggle”), German Low German giecheln (“to giggle”), dialectal…

Etymology from Wiktionary, CC BY-SA 3.0