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1.
The uppermost part of a sports arena. Used to exaggerate the altitude of the highest seats, i.e. high altitudes give you nosebleeds.
We ordered our tickets later than everyone else and were forced to sit in the nosebleed section high above the field.
by Webster April 20, 2004
 
2.
Hardcore part of the mosh pit
Yo dogg these chiks are bouncin the nosebleed section topless
by J-dogg March 21, 2004