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1.
A display of mock or sarcastic sympathy. Often used in reply to someone whining about something that is his or her own fault or that is ultimately unimportant.
You: My mom is such a bitch! She caught me peeing on the cat and now I'm grounded!
Me: Boo fucking hoo.

- or -

You: I dropped my ice cream on the ground! My day is ruined!
Me: Boo fucking hoo.
by Bug0 May 24, 2008