bleh exclamation 4adjective 1forms 2 exclamation4 •(slang) An expression of mild disgust, possible imitative of vomiting. •(informal) Used to imitate vomiting. •(slang) Used to reflect general indifference to a situation or topic. •(slang) An interjection to show affection for someone, related to blepBleh, I love you, Kat. ― Bleh! adjective1 •(slang) Mildly uncomfortable; not good.I'm feeling a bit bleh.What did you think of my mother? ― She was just bleh. formsmore bleh · most bleh