guava, noun
2. [Acronym formed on the initial letters of grown (or growing) up and very ambitious.] A term used of an upwardly mobile young adult. Cf. general English ‘yuppie’.
1989 Style Feb. 125Guava: There seems to be some confusion about this demographic ugliness. Some say it stands for Growing Up and Very Ambitious, others say Grown Up And Very Ambitious and a third opinion exists that the little brutes are not Very Ambitious at all, but just Vaguely Ambitious...There are a number of professions and careers to pursue which would give the aspirant Guava sufficient velocity to be catapulted into the limelight.
1992 ‘Ivan Jellicle’ in Scope 13 Nov. 51Besides being a Guava (Growing up and very ambitious) Wayne’s also a bit of a daredevil.