It is a handsign meaning "asshole"
DeJuan: Good Job, Mike!
A good thing, something lucky or beneficial; typically a British saying.
Maybe it's a good job that I didn't go to that party. I heard it was busted.
can be used as an insult. When someone says something they just found out, but you already knew. Stating the obivous.
1+1=2... Good Job! or Planes fly in the sky... Good job!
A "Get-Out-Of-Debt" job. A well-paying job which people take in order to pay off any debts, it is usually an unenjoyable job.
Matt: So how do you find your new job as a Banker?
Andy: Well, it's a good job.
Matt: Don't worry mate, you'll be able to quit in two years.
Something people say when they think you really suck.
Good job, Bush!
Way to go! 50%!
Good job, ass hole.