Working odd summer jobs has been 'the sum of' my experience so far. [=has been all the experience I've had so far]
That picture 'sums' him 'up' perfectly. [=that picture perfectly shows what kind of person he is]
“So, you don't want to go because you think it will be boring?” “That just about 'sums it up'.”
(..) Keep it! having made the swim in hours, minutes and seconds. years old Elizabeth Abbott, arrived at GMT, Mrs Abbott, how would you sum up in words this achievement? I suppose... anything is possible. Are you ready? Yeah. (..)2008 The Curious Case of Benjamin Button