A tiny freshwater fish, Poecilia reticulata, popular in home aquariums, that usually has a plain body and black or dark blue tail for the females and a more colorful tail for the males.

A surname.

plural of guppy

Alternative form of guppy

(obsolete) A high earning gay person living in a major urban area, especially a male

someone foolish, easily surprised, or naïve. Used in a slightly derogatory or playful manner. Related to ones expression resembling the open-mouthed O-shape of a guppy fish.