What is the meaning of Gup?

ISO 639-3 language code for Gunwinggu.

Gossip or rumor; nonsensical or silly talk; blather.

An elected head of a gewog in Bhutan.

guppy (freshwater fish of the species Poecilia reticulata)

(The addition of quotations indicative of this usage is being sought:) any small fish

anything small

Source: wiktionary.org