A combination of the letter T and F, used on True/False tests, made just ambiguous enough so an unsuspecting teacher would mark it correct at a glance, regardless of the answer.
Usually teachers happen to be suspecting and mark it wrong instead.
Johnny clearly didn't pay attention in class. Half of the questions were marked with a tralse on the quiz.
To cut a long story short. To skip the boring part(s) on a story and get on with the point.
Me and my friend were hangin' out at the mall when we met thís weird hobo who gave us booze.
Anyway, TCALSS, we got really drunk and now I'm terribly hung over.