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Meaning:
This word literally means natural stupidity in japanese. Also, it means idiot, stupid, dumbass, and is used to describe a very forgetful person. It can be used in a variety of different ways, as a noun, and an adjective.

History:
This word came to be around March 2004, when a student called Yu Eric "Tenbo" Shimizu that goes to St. Marys International School in Tokyo Japan started to be very forgetful. He didnt realize that someone took his lunch box, and when some of his classmates asked him if he didnt forget something, he said "Oh No! I forgot my tomatoes!!" (soo random of him to say that), and he didnt realized that someone hid his lunchbox. From then on, he started to do other stupid/forgetful things, so the name tenbo was made.

Tenbo comes from 2 different Japanese words. Ten comes from tennen, which means natural. Bo comes from boke, which means stupid/forgetful/idiot.
Yu! Don't be such a Tenbo!!

Eric is so tenbo like.

Oh my god, Yu!! Your such a Tenbo!!!
tenbo by Tenbo June 9, 2005

Tenboner Explosivo

Something that is so cool, words hardly contain it. Surpasses even ballsdeep,
Mignola's Art of Hellboy is Tenboner Explosivo.
Tenboner Explosivo by Fetorpse August 17, 2003
Tentbox is a hotbox in a tent.
Guy 1: "damn we gotta tentbox your garage for old times sake before they move out"

Guy 2: "It'll sell quicker trust me"
My girlfriend just Teaboxed me.
Teabox by MDYEMS August 9, 2010

Tenboberoonie 

I need tenboberoonie for the taxi driver, I've already forked out my share thanks very much!
Tenboberoonie by Peneleope Pitstop September 3, 2007

tenboner 

1. An adjective describes something that is boner, only amplified tenfold, incredibly stupid or lame, see also tengay

2. A person, place or thing bearing the characteristics and traits of tenboner.
1. Your brother is so fucking tenboner.

2. "Carson Daly is a tenboner" - MC Fumunda
tenboner by Fetorpse August 17, 2003