A person who is obsessed with Girl Scout Cookies, to the point where they don't ever share their cookies, they have a calender counting down to the opening of the new cookie season, and they occasional sleep with the famous green vest on....
Friend: Dude can I have some of your Tagalongs?
GSCW (Girl Scout Cookie Whore): No bro.
Friend: But you have like 20 boxes!
GSCW: These are barely gonna last until the season opens up in 39 days, until then get your own damn box!
Friend: Your such a fucking Girl Scout Cookie Whore!