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.
* Blows load on face *
Hero: BLEH! bitch!
Person 2: "bleh."
2. Something to imply that you don't really like or are bothered with something, or if it's a bit boring
E: We'd better go to German...
A: Bleh...can't be bovd!
E: Yeah same...haven't done my work
A: What about this one
E: Bleh...bit grey...try the purple one on
A: Bleh not really that fussed...Starbucks?
E: Ooh fab!