1. Dull; boring event
2. To diss someone or something
1. I had a very blah day today.
2. Your face is blah!
by Edrianna February 23, 2008

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blah

blah blah blah.

Waffling. Talking shite or bollox or bullshit
All the other definitions on this page for this word might as well read "blah blah blah..."
by F.Arkov June 27, 2006

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something you would say when you barf
BLAHHH!!!!!!! im hella barfing!! BLAHH!!
by F.Garcia October 27, 2002

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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.
by The Fish Who Cannot Be Found September 15, 2010

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'Blah' is a replacement word for 'bro' or 'brother'. It is often used when the speaker is not bothered to pronounce the listeners name. 'Blah' is often used after the word 'chyeah' to emphasis excitement or reinforce the speaker and listeners understanding.
Speaker 1: "hey dizzle, you enjoy the party last night"
Speaker 2: "yer it was pretty sweet, did you end up taking the chick back to yours?"
Speaker 1: "chyeah blah"
by Frenchy929 October 20, 2009

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When saying "blah" to someone, means you're not really listening and you don't care what they have to say to you. especially if it's something really important.
For example:
Sally: Did you watch those aliens attack our planet yesterday?
Fred: Blah
Sally: You are a bad pinecone
by DuckieGal155 September 09, 2008

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a random word that people use to break a silence or to have a blah war.
"Omg-osh yesterday was boring"...an hour later w/ nothing said "blah" OR "Hay Sam! blah" sam: "Blah" george "BLah" "BLAh" "BLAH" sam: "BlAh" george "bLaH" sam "bLAh" george "blAH" sam: "fine you win the blah war!" george "yay, now thats some uber pwnage right there!"

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