A book of collected words or phrases spoken by someone named Scott.
Words and phrases which are inaccurate, silly, mispronounced, mistakenly said. Not said correctly
They then get added to the 'Scottism' book. Mainly added because they're funny and make people laugh unintentionally
That's another scottism
Oh it's another one, add it to the book.
He's said another one, add it to the scottism book
That's a pearler, add it to the scottisms