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a mildly derogatory slang used to refer to Bangladeshi-Britons, especially those Bangladeshi-Britons of Sylheti descent. They speak Bengali horribly with thick Sylheti accents and those born and brought up in the U.K. usually speak English as well with a very thick accent. Their English dialect depends on the region of U.K. they are brought up in. All Londoni families own a restaurant which serve Indian cuisine and is a hub for providing jobs to their newly-arrived relatives from Sylhet who have decided to stay back illegaly.

These people try to give an impression of being really rich and well off to their Bangladeshi friends and relatives and think they are really of a higher class with more status and cooler than them just because they live in England, when in reality they are a bunch of jokes who neither the British nor the Bangladeshis really give a shit about. They have horrible sense of style and have no clue what big idiots other people think they are.

Note: This in no way applies to Bangladeshis living in other countries like the United States or Canada where the Bangladeshis living are actually sophisticated and educated unlike their British counterparts.
Half of Britons today are Londonis!

That londoni chick speaks Bengali so bad. My fart sounds nicer.
Londoni by G--Money April 7, 2007
word refering to underwear
"Your londons are showing!" This is what I tell my five year old when her panties are visible to the neighbor boys. As in, "I see London, I see..."
londons by slamont78 September 1, 2008

Lindonism 

The act of being very gay
Oh my lord you committed a Lindonism”
Lindonism by Peniscrusher July 20, 2021

Londonesia 

A word that describes the careless and unlawful act that Indonesians (specifically the Jakartans) do while being in London. First it is widely known that Indonesians are not accustomed to rules and regulations (sadly). Running traffic lights, being 2 hours late for a meeting, getting on or stopping public busses (or public transportations for that matter) anywhere on the streets (not on bus stops or the designated spots), never to understand the queuing system, having more than 3 people on a motorcycle (often a family of 5), not to mention jaywalking, u-turning illegally, driving under the influence, and a million other traffic violations and simplified bureaucracy; when done in London, it is described as the act of Londonesia.
I just parked in front of Buckingham Palace to quickly take a selfie with the palace in the background is very Londonesia.

Trying to flirt then bribe the bus driver to stop in front of the restaurant where I am meeting my friends instead of at the bus stop is so Londonesia.

Insisting to get an ashtray from the waiter/bartender at a restaurant/club so I can smoke a cigarette indoor is a Londonesian thing to do.
Londonesia by 123rian October 14, 2014

londonitis 

I severe issue where you keep referring back to London in conversations and leads to an unhealthy obsession.
Conversations with him have been difficult after Londonitis!
londonitis by MillaShows March 2, 2017

Londonish 

Something that has to do with London
a garden in Londonish commutersville

posh Londonish accent
Londonish by alcolc October 3, 2010

londonianese

An idiot from London who thinks that they are the best but they truly know that the mancunians are the best. They have a posh accent that say grarse instead of grass. They cant talk properly with their accent so no one really knows what they are saying. This makes it easier for people to bully them.
The mancunians have a better accent that the londonianese
londonianese by bsang11 April 10, 2023