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Much like a hoodrat sleeping with all the guys in her hood. a guildrat is a girl on an MMORPG who gets guys in her guild to buy her things moving from member to member until she eventually switches guilds and begins again.
"omg Aliveos can you believe Ramya? Last week she asked Chuch to buy her epic mount, this week shes flirting with Dagox"

"No way, what a guildrat"
by definition of dopeness June 10, 2009
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