OriginPossibly a modification of Scottish Gaelic boiteag 'maggot'
- often, uncountable, with-definite-articleThe disease caused by the maggots of the horse bot fly when they infect the stomach of a horse.
- broadly, often, uncountable, with-definite-articleInfection by maggots under the skin of cows, or by sheep maggots in the frontal sinus of sheep.