nosebleed

noun4

1. •
   Haemorrhage from the nose (usually, blood flow exiting the nostrils that originates from the nasal cavity).
2. •
   (slang, figurative) Mental overload (usually attained as a result of having to comprehend new and/or complex concepts or languages that one is not particularly skilled with).
3. •
   Ellipsis of nosebleed seat.
4. •
   (slang, no longer used) Nerd; geek; dork.