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1.
A young adult, specifically a college student in a Greek organization, who attempts to get invited to as many fraternity or sorority formals (prom-like social gatherings - usually hosted at a third party venue where the organization gets really dressed up and then shitfaced with their dates) as possible. The motive for such behavior usually is due to the desire for hot facebook pictures, free alcohol, a chance to get dressed up in overpriced formal attire, a shot at getting ass, to impressive one's friends, to rebound off an x, or any other insecurity one can think of.

(Not to be confused with prom whore - one who goes to way too many proms)
Jackie is now single and because of this she has become a formal whore.
by formalprude98 April 20, 2009
 
2.
A formal whore is someone who attempts to go to as many college (in Oxbridge) formals as possible. They will stop at nothing to get a place at a formal they have not been to.
A: I went to King's yesterday! (proud) Now I only have Tit Hall to tick off.
B: Oh my god you formal whore...
by alexapoo March 10, 2011