A funny nickname for the main character of GTA3, nice alternative to, "the mute dude from GTA3". People call him this in reference to the way Maria kept calling him this throughout the game.
Oh, you mean Josie? No dude, shes totesfido, she would never cheat.
By Editha
Fido
Waste matter that has passed through the anus of a dog (Canis). All too frequently malodorous; generally displeasing.
"Tom & John both trod in a fair amount of Fido while playing football in the back garden, then unthinkingly brought it into Mary's clean house on the soles of their new sneakers, soiling the scullery floor."