Definition of guppie:
(n) :
(sometimes derogatory) A foolish, easily surprised, or naive person.
(n) :
(dated) A high-earning gay person living in a major urban area, especially a male.
(n) :
(climbing) A climbing hold, refers to the way the climber's hand is turned sideways and grips a hold by cupping it with the little-finger side of the hand.
(n) :
Alternative form of guppy. [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. The guppies can vary in size, but males are 4 cm (1.6”) and females are 7 cm (2.8”).]