The French celebrate that day because it commemorates the Storming of the Bastille on July 14, 1789. It was a turning point of the French Revolution. Also, Fete de Federation was held on July 14,1790. It was a way to celebrate the constitutional monarchy in France.
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More context?? itd be greatly appreciated, so i could help you.
1 . The meaning of boo is to suddenly surprise someone.
Or , to show dissatisfaction and disapproval.
Also, a slang you could call your lover.
2. A boo could mean boyfriend or girlfriend .
3. Anyone calls anyone boo I guess .