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1.
to express disintrest, tiredness, or overall feeling like crap.
Bleah, im so tired.
ugh, i feel so bleah!
by Drae December 18, 2003
 
2.
Bleah defies definition. It can be used in many forms, such as...
1. Tiredness/ disgust.
"Bleah, I'm so tired."
or
"Bleah."

2. Exclamation of joy.
"Yay, school is over, bleah!"
or
"Bleah!"

3. Agreement.
"Bleah, thats right."
or
"Bleah!"

4. Disagreement.
"Bleah... I dunno."
or
"Bleah..."
by Zorak April 24, 2005
 
3.
the sound your ass makes when it shotgun blasts muddy shit. Can also refer to said shit.
I had some bad food and had to go bleah.

or

I can't make it to work, I have a bad case of the bleahs.
by poo-poo-a-doop April 29, 2009
 
4.
To be some be some kind of Matt-HeW form or state.
That bleah stole my bleach, son of a bleah.
by mR. Ua March 08, 2004
 
5.
bleah is a word that I MADE UP!!!!!!!!!1
Woah, dude! I just bleahed all over the couch! Rad!
by Curse Uchiha July 30, 2004