Meaning your friend, mate. stems from the word blud.
"Oi blah chuck us that beer!"
by Oki3 July 22, 2006
A blah is a vagina. Queers and Australians (no relation between those too, of course. :p) typically refer to the vagina as a blah. When the word vagina is said quickly, it can sometimes be mistaken for the word blah.
Go stick it in your blah!

I told Brenton's mother to stick it in her blah, but she didn't hear me.

Last week, I got Stacy to take her pants off and show me her floppy blah. It was nasty.
by Atrex December 18, 2005
throwing up or puking
That sushi made me wanna go blah.
by chris November 18, 2002
a word oftentime used out of sheer randomness, other times used to substitute for other words you don't want to say or really don't have a word for, can also mean dull or boring
"How was your day today?"
"It was very blah."
by bloodyangelz0 December 19, 2003
that time of month. the feeling a woman has when she starts her period and has no energy.
Amy: Sarah, you want to go horseback riding?
Sarah: No thanks Amy, I've got the blahs..

Amy: Oh.... Gottcha
by blah February 19, 2015
When words fail, Blah speaks.
Teacher: Whats the answer to number 5, Matt.
Matt: Blah

Teacher is writing on the board in math class, room is filled with silence. Because words have failed the young students, a lone peer named Keith states the immortal term aloud "Blah!!"
by Patrick Hampton January 26, 2015

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