Longman Dictionary of Contemporary English - mouthful

~ n 1 an amount of food or drink that you put into your mouth at one time  (That was a great steak! I enjoyed every mouthful.) 2 a mouthful informal 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 give sb a mouthful informal especially BrE to speak angrily to someone, often swearing at them 4 say a mouthful AmE informal to say a lot of true and important things about something in a few words