YAK

a made-up name for a drink. —Melbourne Congress Approved Glossary (2.4.92)

(slang) idle talk or chatter. . . . this is a seated High School Indoc - and the coach simply carries on the most invalidative yak that he can possibly think up. -Levels of Skill (6 July 1957) a made-up name for a drink. (slang) idle talk or chatter. (slang) talk much or idly; chatter.