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1.
one of those multi-usage terms originating from Russian. Can be used as an exclamation (like dam) or an insult (like bitch).
"blya! I got a test tomorow and i didn't prepare yet."

"you dumass blya. you don't call a lady 'cunt' on the first date."
by shmusky April 03, 2005
 
2.
Russian expletive "shit" (figuratively). Pronounced like "bla", but with a softer "L". It's what you might say if your car won't start in the morning, and you're going to be late for work.
Blyah! I just broke my favorite coffee cup.
by Jamie Chivers May 15, 2006