Another rendition of the word blah, but more fun to say. Exchanging the a to a u just makes the word kinda plop out of your mouth when you open it, giving it a nice bluuuuh kinda sound. Bluh can also be used with additions of exclamation points, carrots, and my favorite, the money sign. eg. bluh! bluh^ bluh$
Bluh, I don't wanna do my homework.