an amount of food or drink that you put into your mouth at one time:
Michael told his story between mouthfuls.
Betty drank a mouthful of beer.
He took a mouthful of his pudding.
a long word or phrase that is difficult to say:
Her real name is a bit of a mouthful, so we just call her Dee.
3 informal especially British English
to speak angrily to someone, often swearing at them
4 American English informal
to say a lot of true and important things about something in a few words