look up any word, like b4nny:
 
1.
A very popular sex act in Japan that involves banging a prostitute dressed in anime while eating a bowl of Cap'n Crunch cereal.
Toshi woke up next to a pile of vomit this morning because he was crunchbanging that chick until 4am last night.
by ahornysockpuppet February 11, 2013
 
2.
1) When a computer crashes. 2) A linux distro with the logo "#!"
Dude, that will crunchbang your computer.
by C_House October 31, 2009