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1.
To outstandingly destroy or defeat an opponent or obstacle, especially when the odds are against the one blaining. Term was originally thought up by Dan and Tom, better known in the Halo community as the Ogres. The word Blain itself comes from the last name of the famous magician David Blain, who has on many occasions "Blained" the laws of physics and the limits of human anatomy. So to Blain is to perform a crushing victory in a situation in which defeat is almost certain.
"Oh my nerd! I just Blained that noob"
by Bill Forrest April 01, 2007
 
2.
what comes out when one is headshotted
Omg that n00b had last stand on and I sniped him and blains came out, lololololololololol
by Mike Hackett May 19, 2008
 
3.
A man of high quality in "MANY" different facets of life. The person posses many traits that resemble that of a heavenly figure. All characteristics possessed by a Blain can be either desirable or not.
Brian Warner

The Blain in class had not showered in weeks and began to grow a lions mane and smelled of sour milk.
by bsmae March 05, 2008
 
4.
English, adjective: to eat gluttonously
"yo i just ate 8 mcchickens"
"you are so blain"
by jackedtansweet April 14, 2010
 
5.
bloody rain
Its blaining outside so I can't walk my dog.
by na79 April 30, 2011
 
6.
1. v. to get owned.

Showin the 'blain'
1. phrase. someone who is blainin is simply showin the 'blain'

Important Housekeeping

1. The word 'blain' cannot be overused if the person saying the it is drunk or high.
2. The word is especially acceptable and encouraged to be used when the person getting owned is drunk or high or the person using the word is drunk or high.
3. The blain voice is highly encouraged
EX. 1
Chap: Mac, what is wrong with your face?
Mac: I fell on it while I was blackout drunk lastnight.
Chap: Blaind!!!

EX. 2
Eric: Garrett, why the fuck did you just shove me in the pool?
Garrett: BLAIND YAH!
by Young Char September 22, 2009