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Ok, stupid question.
Naruto aways says Dattebayo(sp?) What does it mean?

'Ero-senin' does not mean pervert...
Even in the english translation, i doesnt mean pervert....
It means: 'Pervy Sage' or 'Perverted Hermit'

I know a few japanese words as I've been taking Japanese for 6 years... not that I've learned a whole lot.

A few corrections that I can think of right off the top of my head

Damn - Chikushou They say Kuso to shorten it. I've heard either Shikamaru or Kiba say Chikushou before.

I've never known "Koi" to mean "Come Here" But I could be wrong. I've only known it to mean "carp" or what you would call your lover or like calling the other person "love" as in a name.

((Ohhhh! Here! I'm going to post up some sayings and words that you can use in Japanese. It's romanized. xd ))

Speak
heart "a" like "ah"
heart "i" like in "image"
heart "u" like in "June"
heart "e" like in "pet"
heart "o" like in "colt"

arrow obasan: aunt
arrow obaasan: grandmother (Remember to stretch the repeating vowels when you speak them.)
arrow ojisan: uncle
arrow ojiisan: grandfather
arrow shujin: husband
arrow shuujin: prisoner
arrow e: picture
arrow ee: yes
arrow mo: also
arrow moo already

ninja When greeting Kakashi-sensei in the morning:
Kakashi-sensei, ohayoo gozaimasu.
ninja When greeting him in the afternoon:
Kakashi-sensei, kon'nichiwa.
ninja When greeting him in the evening:
Kakashi-sensei, kon'ban'wa. (Or you can just shorten it to Sensei or replace whatever name you want in there.)
ninja When you want to tell Kakashi to please close his book xd :
Hon o tojite kudasai.

idea How are you?/Are you in good health?
Ogen'ki desu ka?
idea Most Japanese people would respond to the above by saying:
Okagesama de (which means something like "I'm good" in English, sort of)
idea How do you do? Pleased to meet you. :
Hajimemashite, doozo yoroshiku.
idea The pleasure is mine. :
Kochira koso.
idea Will you give me a glass of water, please? :
Mizu onegai-shimasu.
idea Where is the bathroom? :
O-tearai wa doko desu ka?
idea Where is a public telephone? :
Koshu-denwa wa doko desu ka?

In a lot of Asian cultures, a good greeting is extremely important. So is a good ending. How you greet a person tells them your social background, your personality, and everything, unlike American culture. xd Also, -san is usually added to the ending of the name of a person older than you. It's because Asians like to keep their ranking clear and distinguished.

((Brought to you by my friend, Kakashi Hatake of Dusk. 3nodding ))

Well, here's some stuff I know:

Shira/Shiro=White
Kuro = Black
Kage = Shadow
matteyo=Wait up/hold on
Rai = Lightning/thunder
bakana = You idiot(I'm pretty sure)
arigato = Thank you
Nanin = What the-
Ni san = Sister (Stranger, feminine)
Ni Chan = Brother (Stranger, Masculine)
Ni Sama = Big brother

That's all I can think of right now.