Used by Hammyrabi and friends as a general exclamation or greeting. It can generally mean anything from insulting, complimenting, meditative, or angry. It is a reference to another world in which such creatures (part ass and fish) could very well exist, i.e. the assfish challenges us to think about our surroundings and what we do.
1. Jimothy: Hey man, what be goin' on.
Hammyrabi: Assfish, my brother. Assfish.
2. The car's not starting.