self esteem engine

A person who is confident to the point of deluded arrogance. Bumptious against any reservations whatever.

Person a: "That guy's a bit too sure of himself..."
Person b: "Sure of himself? He's a flippin self esteem engine!"

fact guaranteed

A "fact guaranteed" is an emphatic affirmation of a thing or a situation (usually positive), that is either held to be true or about to happen.

Something agreed upon.

A promise, a binding oral contract.

person 1: you going to Rock Werchter hey?
person 2: fact guaranteed man, fucking fact guaranteed!