Plural of gleek; multiple fans of Glee, or people performing the act of gleeking.
Simple plural formation from 'gleek' by adding '-s'. Follows standard English pluralization rules for nouns ending in 'k'.
The word 'Gleeks' became so popular that it formed an actual community identity—search for '#Gleeks' online and you'll find hundreds of thousands of posts! It's a modern example of how fandoms create linguistic in-groups, similar to how 'Trekkies' formed around Star Trek decades earlier.
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