A phrase used at the moment one is speaking and realizes that they know not what the hell they are talking about, or they run into a massive stutter and must start their point over. The phrase removes what was previously said and the person talking can try again to relay the message that was previously goofed.
Jordan: So we were leaving the party and...er...uhhmm..scratch it, rewind. So we were leaving the party and this bitch says...(continues with story)
Professor Higgby: Okayclass, t-t-t-tttt-tttooday. (Pauses until roars of laughter cease) Today, were going to learn Calculus.
prrt ah prrt prrt ah ah prrt ah eh prrt se prrt prrt prrt se ah prrt prrt pr ah eh se prrt prrt prrt prrt pr ah eh eh se er prrt p ah eh se er er prrt prrt prrt ah ah se prrt by the way destiny still arrives
person 1: can I show ya something?
person 2: sure man
person 1: lemme show you how to scratch it
person 1: prrt ah prrt prrt ah ah prrt ah eh prrt se prrt prrt prrt se ah prrt prrt pr ah eh se prrt prrt prrt prrt pr ah eh eh se er prrt p ah eh se er er prrt prrt prrt-
person 2: 911, my friend is having a seizure
a besh apedupaepedipapedupa apapesh apapupa a besh u besh obetipupesh abetubidipieded besh abebububpit besh u besh
thanos: besh apetupetupeta let me show you how to scratch it a besh apedupaepedipapedupa apapesh apapupa a besh u besh obetipupesh abetubidipieded besh abebububpit besh u besh