Top Definition
Some one who is addicted to the popular Fox Show about a high school show choir. A Gleeker Would NEVER miss an episode and finds themselves singing Glee inspired songs through the week until the next episode airs.
Betty: I can't hang out tonight I have to be home on time to watch Glee!

Rose: Your such a GLEEKER!!!
by Ladii SaGa November 02, 2010
2 Words related to Gleeker

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