Definition from Wiktionary, the free dictionary
- (slang) A word used in conversation to reflect general indifference to a situation or object of conversation.
- What did you think of the movie?" "Bleh, poopy. You?"
- (slang) An expression of mild disgust, possible imitative of vomiting
- (slang) Mildly uncomfortable; not good.
- "I'm feeling a bit bleh."