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A word used to replace swears in the popular chat forum "CokeMusic." as a censour.
"So I told that jerk to kiss my ass...but it came out all wrong and just said kiss my blah."
blah by coolperson512 May 11, 2006

blah boo bam 

Techno bechno you don't know that you're a ho shiza maniza you love saliva chi chi bo bi bom bom bo bam chicka choo choo cha cha lick my goosh you stupid douche, your mom is a noggined who loves to be tabbogined. i love to rap and make up all this crap and act like a dirty ho thats just been smacked. do do do you like to poo with your dc shoes you skater wannabe gladiator, fuck you bitch why don't you go and hitch a ride from macauly caulkin. I hate you and your race you're the biggest fucking disgrace, why don't you go to hell and die.
Jam to my track and don't look back or i will turn you black0!
blah boo bam by Fuckthepainaway March 24, 2005

"BLAH, BLAH, BLAH, BLAH..," 

That which follows logically, typically in the vernacular of routed IP traffic. Arose from the writings of technical manual authors when referring to traffic passing through a router past a certain control point. May be capitalized or lower case.
After making the new cache settings, port 80 will read "xxxx" "BLAH, BLAH, BLAH, BLAH..,"
A blah is another name for rolled up Cannabis. It is made from the plant Cannabis Sativa. It's intended purpose is for use as a psychoactive (mind-altering) drug.

The main psychoactive ingredient in a blah is THC (delta-9-tetrahydrocannabinol), but more than 400 other chemicals also are in the plant.

Immediate physical effects of a blah include a faster heartbeat and pulse rate, bloodshot eyes, and a dry mouth and throat.

A blah is normally made by taking a cigarette and replacing out the tobacco with cannabis. A blah can also be made by using rolling paper and a filter.

It is common practice to smoke a blah in a group and follows the concept of puff-and-pass.
1. That blah got me so high!

2. Yesterday, i smoked a blah with my friends.

3. We took the weed out the blah and put it in the pipe instead.
Blah by The Fish Who Cannot Be Found September 16, 2010

A'ight Blah 

When a person is disgusted or just plain annoyed by what someone else is saying; just tell them "a'ight...blah"!
A'ight Blah by Brandon November 29, 2004
A blah is a non-descript, boring, often stupid person that no one pays much attention to. Could be someone sitting right next to you at a restaurant, a bus stop, work, school, etc.

Often thought to be urban legends, but that's just because no one notices them.
1. Having a conversation with a blah like like talking to a rock. Except that the rock is actually kinda cool.

2. Some day the blahs are going to revolt, but nobody will care.

3. Have you ever seen a picture of a blah? Neither have I.

4. Huh, a blah sounds a lot like me...
blah by the rifleman May 2, 2006