Nosebleed Section Meaning

(idiomatic) The seats high in the back of bleachers, stands, or the balcony at a theater or stadium.

Example: 2001, Sara Paretsky, Total Recall: V.I. Warshawski 10, ISBN 978-1-444-76147-3:
  'Nor do I have a family box: it's the upper gallery for me, what we call the nosebleed section.