It can't really be defined. Nojob is a word you can use for alot of stuff. Like people and deeds. In theory it means that someone who is a nojob won't get a job, or at least only get a bad one. Like a construction worker who used to smoke crack and didn't pay attention in school.
Example 1
Guy1: Look, that guy is smoking weed in class!
Guy2: Hahhaha, what a Nojob!

Example 2

Guy1 and Guy2 talks to another random guy at the start of a new school year. The random guy tells them that he used all his savings on cigarettes and that he got an F in some of the classes last school year. Guy1 and Guy2 walks away and Guy1 whispers "WTF! That's super nojob hahaha!"
by Jjadfi September 16, 2016
Get the Nojob mug.
When a person comes really close to getting a blow job.
Man, I totally took this girl out and payed for everything, but then I got a nojob.
by janetraynaynay July 23, 2009
Get the nojob mug.
Nojob can also be a guy that has sex when he between the age of 12 and 16
Guy 1: Hi did you guys hear what i did today? I had sex!
Guy 2 and Guy 3 walks slowly away while they whisper "nojob"
by jhvjkgvjlgulhjnm October 12, 2016
Get the nojob mug.