Similar to positively but it's even stronger and means you definitely fucking will. It's also easier to spell.
This word is thought to have originated from the gothic slums of the Medway Towns, where local football hooligans once launched flaming sanitary pads at the visiting teams and thier supporters in the 1960's. The reports are not quite accurate because everybody was on drugs back then anyway.
Ryan: 'You gonna shank 'em after the game?'
Ryan: 'You're hardcore man.'