Usually said in the most common of accents, (mainly those which are widely known as the 'chav' accents) used by several semi-famous people of our time, for example: MC Devvo, MC Dezmo and DJ SpitInYerEye, this phrase is usually used by those who believe they 'genuinely know', only with only a slight colloquial and explicit manner. Nevertheless, the people often using this in the most serious of their own ways are often referred to as pricks.
*Ducks 'swanning around' aimlessly, pecking at the floor looking for some food*
Commonly shouted out during those exams that nobody could ever give a fuck about.
Or mentioned in a large group of people, after Captain Obvious makes his most recent discovery.
Almost always followed up by a relating laugh, or the follow-on of the self-owned hilarity of the group, with
.... And knowing is half the battle.
G. I. Joooooeeee.
*Sat in silence, the year 12s continue sitting in boredom after finishing the 2 hour General Studies exam in 3 and a half minutes, with flying colours and full marks.... Except James, because he doesn't have a brain stem....*
Invidulator: Right, Year 12. You have about.... 4 minutes left (of this pointless exam..)