Noob (2nd Definition) 

Originally an (shortened) insult to newcomers in forums or internet games e.g. counter strike, the word has been stolen and is currently being used as an insult with a different meaning. It is used in certain places to describe someone who is slightly - ahem - slow and ditsy. Basically it is used to insult a pesron who makes a stupid comment or somebody who makes many stupid comments.

"the tibula bone exists!" "no it doesn't you noob"

Noob (2nd Definition) by Lotty February 23, 2005

Noob (2nd Definition) 

To get lucky. To win in a contest based on luck or cheats. The first use of this word originated from the character "Noob Saibot" in the video game "Mortal Kombat II".

The character Noob Saibot was named after Tobias Boon (Noob Saibot spelled backwards), one of the creators of the game. Considered to be the most dificult character of the game, Noob Saibot would "cheat" to win. Some would say their defeat by Noob Saibot was luck, chance.

It was common to hear someone say "you got noobed" when they would unfairly lose or to be called a noob if the person won in a "cheating" or "lucky" fashion while playing in a video game arcade.

Example 1 for Noob (2nd Definition) -

Person 1: Wow, that guy was lucky!
Person 2: Yeah, you got noobed!

Example 2 -

That guy definitely cheats to win. What a noob!

Noob (2nd Definition) by Aqati October 20, 2011