1. What you say when someone is going on, and on, and on about their boring ass life and you want to show how obnoxiously hilarious you are.

2. Also a Finding Nemo reference.
Kieran: oh! So I forgot to tell y’all that I’m gonna be a father!

Emma: blah blah blah me me blah blah blah blah blah me me me

Simon: that was harsh, Emma.

Andy. But needed. Let’s go watch Finding Nemo
by Pogoextreme July 07, 2018
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"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..,"
by Dougie D July 22, 2006
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BLAH BLAH BLAH

An example of someone chatting bare shit BLAH BLAH BLAH, someone who would probably be a good salesmen, doesn’t stop talking. A figure of speech to mock someone.
BLAH BLAH BLAH, have you finished
by Urbantheturban July 08, 2019
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blah-blah-blah

Nonsense words used in English to show speech without the contents having any importance
by Fangsta December 14, 2003
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Blah Blah Blah

What most students hear in school
They just zone out, and all they hear from the teacher is Blah Blah Blah
"In math today we will blah blah blah, blah blah, Blah."
Student: When will I ask Jamie to the dance?
by DaDapster March 30, 2010
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Blah Blah Blah

Blah Blah Blah is another way to say I love you.

Wife: Blah Blah Blah
Husband responds: Ditto

Husband says: I love you
Wife playfully says: Blah, Blah, Blah !
Why does your wife leave you a slip of paper in your lunch that says "Blah Blah Blah" everyday, does she think you talk to much at work? No, that's just her way of saying I love you.
by Yaunti December 16, 2018
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Blah blah blah

What people write when they've lost a conversation or been proven wrong on the internet and have nothing credible left to write.
Person: I think the Earth is flat.

Astronaut: I have literally been to space and circled the planet. I can tell you first hand that it is a sphere.

Person: Blah blah blah.
by Hawk_driver December 28, 2017
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