Code word for Danger as explained in the series "Friends"
Joey: Well, you wouldn't let me in, so I thought you were in trouble.

Chandler: Well, we're not.

Joey: But you called me 'Bert'!? That's our code word for danger!

Chandler: We don't have a code word.

Joey: We don't? We really should. From now on, 'Bert' will be our code word for danger.
by Emma79 December 21, 2014

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Any random old guy you see on the street, especially a weird-looking/badly behaved one. Often used together with descriptors such as "beer gut Bert", "ugly sweater Bert" and "angry Bert".
Dirty Bert over there just grabbed a boob!
by Meme Princess July 02, 2016

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A shmexy fellow who will probably move to a different school after being at you school for maybe a month. He acts gay but that okay because it's Bert and you have to love that stupid cutie. Total ladies man, sweet as a pickle.
Girl: "Omg who's that?"
Guy: "Oh, that's Bert, we use to be friends in Elementary."
Girl: "Well damn, he's cute."
by Astrogirl435 June 27, 2016

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Also known as The Beanie of Awesomeness. It is an awesome red beanie.
Get off my lawn you Bért wearing pot head!
by Pete the Goat September 25, 2010

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Multiple Usage

Term used for misfortune, badluck, substandardness.

Org: Originates from Derry in Northern Ireland where a local chip shop, named Berty O'Neills, famed for its bad chips, was coined into a phrase for most bad things.

Original the whole term was used.
"Went to see a movie. It was pure berty o'neills".

Later shortend to "Berties".
"Drinking alcholic free beer is pure berties"

and finally to Bert.
"Went up the town and all the shops where closed. Pure bert"

Can also be used:

"Did you see that bert. He just flipped his berty bike and landed on his head. Bert one"

trans: "Did you see that idiot. He just flipped his stupid bike and landed in his head. Shit one"

berty - Used before a person, place, thing
Bert One - Shit one
Bertness - Shityness
Ya Bert - You Idiot.
by Gerard Harkin April 15, 2006

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Falling asleep on XBOX Live, preferably in a party with your friends.
Where happened to Joe?
He probably pulled a bert with his hand in a bag of chips.

You better not do a bert again tonight.
by fathony marshall September 26, 2011

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what happens when your playing a video game and your sister starts lagging the internet because shes watching porn
"stop pulling a Bert"
by hansolo314 October 12, 2011

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