Top Definition
The common name for the K-pop group: B1A4. Coined by the eatyourkimchi blog from the Korean pronunciation of the numbers 1 (pronounced: IL) and 4 (pronounced: SA). B1A4 is then B-IL-A-SA, just like how B2ST is pronounced BEAST because 2 is said as 'EE' in Korean.
I'm looking forward to seeing Bilasa on Inkigayo next week!
by lyngenberry November 08, 2013
1 more definition
Word defined for animal puke, mostly Llamas, Goats, Sheeps or any kind of animal usually eaten by savage nomads.

Also another word for a cat's vagina, or whatever it is.
"EW! BILLY! YOUR HORSE JUST BILASA'D ALL OVER THE STABLE!"

"Look at Lisa, that ungrateful twit. She's such a bilasa."
by blackitallbackjohnny June 22, 2012

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