Fuckboy - this is a name used to describe a male under the age of 35 who has generally no respect for himself , his penis and other people , especially women whom he sleeps with. A fuckboy doesn't hold any value to where he will put his penis and or who he will put his penis in , they usually have at least one type of sexually transmitted disease but don't disclose this information with their victims , fuckboys often say whatever is necessary to ensure he will get some pussy from anyone he can fool .
See also arrogant piece of shit , or douche bag, or fuckbag , dirty dick, etc.
I shouldn't have been so stupid to think he actually liked me , he had fuckboy written all over him from the gate .
While it may be used in "Finding Nemo", Mr. Disney (who was deceased, by the way, when "Finding Nemo" was made) did not come up with it. It is an Austrailian saying which was popularized in the movie "Crocodile Dundee".
"Man, that was a great chili dog, but now I've gotta see a man about a wallaby."