Is there a disappointed or sad "boo" equivalent in Japanese?
Kind of like:
Person 1: Hey man, can I borrow 10 dollars?
Person 2: Nah, I don't have any change.
Person 1: Boo, now I don't have enough to go to the concert.
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I think you could say 「トホホ」. It's a lot like "boo hoo". I've heard that it's used more in fiction than in real life, but I think that's true of "boo hoo", too.
Chocolate pointed out on chat that you could also say 「あーあ」. Although I don't see entries for this interjection in any Japanese dictionaries, you can find it in Japanese-English dictionaries such as edict. Edict describes it this way:
oh no (used as an expression of despair or when giving up); sigh of boredom or disgust; oh boy
Another related word is 「がっかり」. Again, I'll quote edict:
feel disappointed; dejected; lose heart; feel emotionally drained; feel let down
Edict lists more parts of speech for this word than Japanese dictionaries, so I decided to link to it here. You can say, for example,
がっかりだ. I think you can also use it as an interjection, though the only place I could find listing it that way was ALC: