[fan-gurl]Informal: Often Disparaging.
  1. Sometimes fan·gurl. an obsessive female fan, especially of comic books, science fiction, video games, music, or electronic devices: a web forum for Star Wars fangirls.
verb (used without object)
  1. (of a female fan) to demonstrate intense excitement at the mention or in the presence of a particular celebrity, film, product, etc., especially one associated with popular culture or technology: This is the fourth time the actress has fangirled out on live TV.

Origin of fangirl

First recorded in 1930–35; fan2 + girl
Related formsfan·girl·ing, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018