Like a weeaboo, but fetishizing British culture rather than Japanese culture. Think that watching Sherlock and Doctor Who give them any actual insight on the country at all and that saying things like "tea and crumpets" makes them interesting. Most likely have never actually been within 100 feet of a real British person in their life.
"Ugh did you see that teaboo over there who's lecturing people on British history that she learned through YouTube? Lame."
"I know, so obnoxious."
by fullmetaloptimist March 29, 2014
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An American who is obsessed with Britain. Some also claim to know everything about British culture just by watching British television.
American: I just watched (insert British TV programme here)! I'm now officially British!
Bob: You're a teaboo!
by LeUrbanDefiner December 17, 2014
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An American who desires to be English and normally base their lifestyle of typical English stereotypes like: drinking tea, eating crumpets and being a posh snob. These people usely want to become English because they liked Harry Potter or because they like green tea. Shortened definition: a English wannabe.
Did you hear about that teaboo James? He moved to England and got beat up by some roadmen!
by Fordobread May 5, 2018
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A person, often a fan of some British-based series such as Doctor Who or Harry Potter or Sherlock, who is to British culture what a weeaboo is to Japanese culture - that is, they want to be so engulfed in English culture that they shit the Queen.
Mark is such a teaboo. I mentioned Doctor Who offhand when I was next to him, and Mark instantly rattled off his theory that Severus Snape was a Time Lord while drinking two liters of Earl Gray. Then he sped off, but not before whispering in my ear the URL for his tumblr page.
by Zappy Dan the Magnet Man March 26, 2014
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A person obsessed with British culture, like a weeaboo is to Japanese culture.
Mike: Man, Joe, you're such a teaboo!
Joe: fuck off, bloody cunt, the name's Duke Joseph, I'll make sure the Queen has your head for this.
by YeOldeTurtle August 3, 2015
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To get it out of the way, the most uncommon definition of the word teaboo is something that is taboo in English/British culture.

Most often, the word teaboo is used to describe what would basically be a weeaboo who instead of obsessing over the Japanese culture, they obsess over the English/British/Etc cultures.
These people are commonly fans of BBC and tonnes (see what I did there?) of British T.V. shows, such as Doctor Who and Sherlock.

These people will constantly spell words like British people would and use the slang of the British. You can also commonly see them eating "BRITISH" food, even though it's probably just cheap trash not even made by British companies.
In a Discord chat

teeaboo: "oi m8 how u doin bruv? "
normal person: "tf are you saying? what is 'bruv?'

teeaboo: "it means bro/bruvva"
normal person: "fuckin hell man you give no context"
teeaboo: "you takin the piss? i give loads"
normal guy: "shut the fuck up with your brit slang we're not friends anymore"
teeaboo: "fine then you can go bugger off you cunt"
normal guy: "teaboo" *leaves chat and proceeds to chug bleach*
by iiToxicMinded September 26, 2016
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Discussing Tim Teabow. Bringing up Tim Teabow's controversial behavior is taboo in polite company because many people have strong opinions about it, and discussions of such tends to start arguments.
Friend- "Did you see how ridiculous Teabow was on the field last night. He must have kneeled down like every.."

Me- "Hey! That subject is teaboo! Let's talk about something else...."
by GregZILLA! January 10, 2012
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