A word that is used by stereotypical vampires.

1. not rally caring enough to finish your reply.
2. disgusted beyond belief.
3. being in the state of extreme boredom.

Bleh is synonym of Blah. Bleh is the word you say when you're frustrated, or when you feel like puking. Or just when you're bored.
Some people use it as an adjective, like in "I feel so bleh"... It this case, it means that the person is in a mood to say "bleh".

Term meaning lack of interest

What heroes say when they climax and jizz on a girls face.

Made famous by a pornographic video depicting a male penis with rotating balls releasing its contents on the face of a participant (a hot porn star) while a stick figure traverses her body and yells "Bleh!" at an extremely opportune time.

A word used when someone just gives up on what they are going to say

What you say when you have nothing to say.