nosebleed

Short definition from Wiktionary

Noun

1. 1
   Haemorrhage from the nose (usually, blood flow exiting the nostrils that originates from the nasal cavity).
2. 2
   Nerd; geek; dork.
3. 3
   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).
4. 4
   Ellipsis of nosebleed seat.