Essentially 'N' representing 'Not', first used by Ryan Dunn in Jackass 3 (2010), during a scene in which he had to jump over a small river. The term means to express dismay, and to undermine /dispel an idea or to refer to any activity whether past, present, or future tense as an undesirable act.
R.I.P. Ryan Dunn
Past Tense: "Dude, that ramp was n-awesome."
Present Tense: "N-awesome man, this is starting to freak the s*** out of me."
Post Tense: "No, I won't do that! N-awesome dude! N-awesome."