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1.
A large, two handed sword similar in style to the katana, but with the hilt and blade curving in different directions. Often used by samurai on horseback.
The samurai cut the stupid fucker's head off with his tachi sword.
by Darin Saine May 14, 2006
 
2.
1. a large Japanese sword

2. a slang word for the "top" or active partner in a homosexual relationship. Probably an abbreviation of "tachi-yaku" (standing-role), a Japanese word for the lead male protagonist in kabuki and other forms of traditional Japanese drama.
1. samurai wa tachi de teki no kubi o haneta ("The samurai lopped off the head of his enemy with a big sword.")

2. kare ga tachi da sou de sugoku umai to kiita yo ("It seems that he is a top, and I've heard that he's awesomely good at it.")
by nek0mimi December 20, 2009
 
3.
A type of Japanese sword.
A tachi is said to be more curved and slightly longer than the katana.
by NinjaAssassin!!!! June 17, 2011
 
4.
any name-tachi. In Japan you can attach tachi to a name and it means that persones group of friends.
Duo-tachi= duo's group
by Nasyki February 28, 2004
 
5.
Japanese slang for the top in a homosexual relationship.

See also neko
Craig is such a tachi! I'm tired of bottoming!
by epyonnxt May 08, 2005
 
6.
Tachi is a word derived from a name that was given to a leader. This leader ended up running his own village into the ground and caused such great chaos in previous battles that it has become nothing more than an insult or a slang term in usage to describe someone of another ethnic background in a disrespectful manner. The man is in some circles real but because of the fact he was a supposid ninja leader there is a lot of mystery clouded around the idea of if he has ever been real.

The common ways to say it now have been changed into many things revolving around homosexuality as an insult because this male when alive was also heavily into homosexuality and open about it. Thus the termage has come to be something along the lines listed below with more direct descriptions on how it has been used locally. I'm only posting this because I see no one else has.

1. Old British male
2. A homosexual who has an inate urge to receive semen regularly.
3. A declaration of ones stupidity.
4. A flaming flat noob dick.
5. Commonly used as a remark on someones attitude in a disrespectful manner.
6. in reference to a dirty female sexual organ. Commonly cut down to the word Tach
1. John isn't from ireland he is a Tachi
2. That Tachi can't keep himself out of the glory hole in the mens bathroom.
3. Come on you can't be that tachi can you?
4. Shut up Tachi!
5. You're such a Tachi I swear to god.
6. I wouldn't bro I think she has a Tach'
by psudonyminous January 05, 2011