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Someone who jumps at or scrapes into every single oppertunity that comes their way.

Someone who always goes to social gatherings, irregardless of whether they are friends with the host/people going or if the gathering will be dry as a desert. They will always be there.
Sam: Hey, is Sarah going to Matt's party tonight?
Tom: Yeah, she goes to everything. She's such an oppertunity whore!
by Selective oppertunist April 11, 2010