The backwards way to spell the phonetic alphabet is not the way it is listed originally. They have interjected an additional ghi into the correct way of spelling it which is
z y x w v u t s r q p o n m l k j i h g f e d c b a
And not
z y x w c u t s r q p o n m l k j i h g f e d c b a
a /b/ tard, or someone who has wasted their life away in the /b/ (random) section of 4chan image boards, who has evolved past poor grammar and a twisted sense of humor and has slowly drifted into a vegetative state where responses are only given to the mentioning of memes and the sight of inappropriate cartoons. (see rule 34)
The word you use when someone in the vacinity of yourself is acting like a noob(someone new to the subject matter).
You can also use this word when you don't like something that has just happened.