The story
- New Latin · derived fromflātulentus
- French · borrowed fromflatuler
- English todayflatulate
Attested since the 19th century; either a back-formation from flatulence or borrowed from French flatuler, either way, see-ate (verb-forming suffix); ultimately from New Latin flātulentus, from flō (“to blow, breeze”).
Etymology from Wiktionary, CC BY-SA 4.0.