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1.
A bottomless pit. Distinguished by an egg-shaped head and inability to get out often. Often found playing a video game i.e. Pokemon, Warcraft, Word with Friends, etc.
"Dude you are such an Eduardo Contreras! You just ate five plates and still have room for more!"

"What you're gay? You must be an Eduardo Contreras."

"Dude don't be an EC, Come out with us tonight..."
by The_MMO October 24, 2011