- giggle (v.)
- c. 1500, probably imitative. Related: Giggled; giggling; giggly. As a noun from 1570s.
- titillation (n.)
- early 15c., "pleasing excitement," from Latin titillationem (nominative titillatio) "a tickling," noun of action from past participle stem of titillare "to tickle," imitative of giggling.