Ghost ship: A paring of one or both characters that have died in canon or AU. It's a ship that's partly dead, but still sailing.
Glomp: A tackle hug
Gif: computer image that moves as animation. Used by fangirls in lieu of words to express their emotions and reactions. Some debate over whether it is pronounced with a hard or soft g sound. (It's a hard G.) GPOY– Acronym for Gratuitous Picture of Yourself. Often used when a fangirl relates to a picture.
Gen: Short for "General" themes, genfic is the term for a story that doesn't have a romantic pairing or plot as one of its driving aims.
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Fangirl Dictionary
RandomYou can't understand fangirls/fanboys? well read this dictionary. It has many words and phrases!