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1.
A derogatory term used to call someone who is not only dim witted but ugly as well.
Person 1: You know I went out with her because I felt sorry for her being pig-ugly but I bet you didn't know that I used to do her homework as well 'cos she was so thick!

Person 2: Shit, so you mean she was a total ratfish then?

Person 1: Yeah.
by sixxon June 18, 2007
 
2.
the man of my dreams
ratfish is the only guy i'd fuck!
by starfish February 18, 2003