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1.
Like a burp, but with a hint of puke.
"When I saw the monkey pee in it's mouth, it made me wanna blarch."
by KingCone January 16, 2009
 
2.
Blarch was an exclamation originally used in Ancient China, in the provinces near present-day Shanghai. It was used most often when one burned one's tongue and distorted natural pronounciation habits.
Lao Gao took a sip of the soup and unexpectedly screamed "blarch!"
by SuperShooter! January 23, 2005