What is Boo Fucking Hoo?
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.
See