Top Definition
military wife, girlfriend, fiance who spends almost all of their free time in a chatroom usually assocatitaed with the base/post thier military member is stationed on
Sgt: Hey PFC why are you so bummed today.

PFC: My wive has become an undergroundoholic, she'd rather be on that stupid underground chatroom site than doin' stuff with me

i.e Sue spends all her time on pendleton underground therefore she is a pendleton undergroundoholic
by Harleygurl October 10, 2010

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