I dont know what this word means.

Weeabo is intended to be a derogatory insult, along with Wapanese. Incidentally, "Otaku" is considered an insult in Japan. They think it's weird that foreign 팬 are proud to call themselves as such.

A nicer way to think of it is that anyone who calls 당신 a Weeabo is xenophobic as hell & resents 당신 for not thinking their preferred culture is superior in every way.

It's primarily aimed at shameless obsessive otaku, especially the noobs who have only been into 아니메 for about 5 years. But much like how Hipster has 로스트 all meaning & has no definitive definition, it's also used 의해 아니메 haters to describe anyone who likes anime.

Also used within the fandom, aimed at passionate noobs, used 의해 older 팬 who've long settled into the fandom like a marriage where 당신 stay because it's familiar, but the romance is gone. The noobs remind them of how embarrassing they themselves once were.

Anyway, Weeabo characteristics are the following:
*Bringing 아니메 & 망가 into any conversation it has no business being.
*Wearing cosplay outside of a convention.
*Proudly displaying your poorly drawn shipping fanart on the internet.
*Being able to name all the Pokemons AND not hating the Final 판타지 franchise.
*Constantly reminding people that English 음악 sucks & American musicians are unattractive (still guilty as shit of this on my part).
*Being a proud & open 팬 of yuri, yaoi, shotacon, lolicon, sibling complex, 또는 furries. (Guilty of some of this too, but America needs to get over it's damn homophobia already).
*Using Japanese words in conversations with non 아니메 fans. (Incidently, this also irritates the shit out of seasoned 아니메 veterans).
*Getting extremely defensive when another otaku points out that your're mispronouncing a word 또는 using it incorrectly.
*Having a ship-to-ship combat in public.
Getting toxic when 더 많이 well-behaved otaku tell 당신 that your embarrassing yourself as well as them.
*Owning an obscene amount of UFO cather 인형 & NECA figurines.
*Owning a 쥐, 마우스 pad with a boob armrest & a body 베개 with a naked 아니메 character on it.
*Having hentai, wallscrolls, & 망가 posters on your walls instead of pinups of real people.
*If being a 팬 of 아니메 is literally your only defining characteristic at school, then Weeabo is actually a well-deserved 제목 used to label a one-character.

From what I've heard, a weeaboo is a person that says they know everything about anime/is an 아니메 fan, but actually doesn't. 당신 probably aren't a weeaboo, though. If 당신 don't want to seem like one, refrain from over using words like "kawaii" "desu", etc.

Basically it means someone who likes 아니메 A LOT to the point where they put 일본 on a high pedestal and think it's the best place on earth and it's only 아니메 and they generally put down America/other countries to make 일본 look better and they force 아니메 onto other people and can't understand why a person doesn't 사랑 it. It's really not a nice thing to call someone, and there's a lot of negative traits associated with it including forcing (usually yaoi) parings on people, harassing Asians (because they think they're all Japanese) really bad cosplay in inappropriate places, speaking in broken Japanese pretending to know the language (desu, sugoi, kawaii,and neko are usually some favorites), and drawing bad fanart/fanfictions and forcing people to look at it thinking they're the best and that they have no need for improvement, the list goes on, if 당신 want here's a funny tumblr all about people's encounters with them.

link

When you're friend said you're a weeaboo for Len they probably meant that you're super obsessed, think he's the best singer ever etc. Now I don't know 당신 또는 them 또는 how they said it so they may have just been joking, but Weeaboo is usually meant as an insult.