Shitfishing is a word that simply means the irrational attempt to secure some anal intercourse. This can be with a current girlfriend or in pubs and clubs. To be a shitfisher is often a hit and miss experience with some girls revolted by the idea. Certain females are known to warm to the idea (no pun intended) and a good shitfisher, if indeed that is possible, will hone in on these ladies.
A successful shitfisher is often heard to yell "i've got a bite" midway through performing the act he has been longing for through out the night.
Mark: "hey, are we going to the clubs to pick up women yeah"
Juan: "only if you come shitfishing with me"
Mark: "but i only catch obese fish"
Juan: "more to fill your plate with *intolerable wink*"