Short for 'Fuck the Navy'. Usually written as graffiti on the walls of U.S. Navy ship's heads (i.e., restrooms, shithouses, shitters), walls around chow lines, and wooden benches. It is often believed that these statements result from job frustration and the belief that the sailors' efforts are not appreciated by the sailors' superiors, family members, or the nation as a whole. More commonly, it arises from heterosexual frustration due to the fact that there are no women to sleep with when you are on a ship (Navy is 90% male, 10% female, and most of the women get cushy shore duty billets anyway).
Petty Officer Shortshank bent down, unbuttoned his thirteen-button bell-bottom trousers (the stupidest pants in the history of pants), and repainted the toilet bowl a grim greenish, chocolate brown. He looked at the walls beside him, both of which were so close that they touched both of his elbows. On the starboard side was a glory hole and on the port side a piece of gum had been stuck onto the wall and formed into the shape of a nipple, surrounded by the words "This is the only tit you'll see today, squid." He did not, however, see any of that thin, pulpy shit paper he needed to wipe the smelly residue from last night's Schlitzfest from his hind quarters. Even the shitpaper holder had been ripped from the wall. In its place were the letters 'F.T.N.' Shortshank sighed and said, "You got that right.'
Abbreviation for "Fuck The Navy" -Term coined by young cocky sailors in the Navy, usually 1 year or less, who think they deserve more respect than their rank gives them without trying to earn it. Also this term is avidly used by sailors who have previously been discharged and couldn't survive in the real world, only to reenlist so they can complain about the job they have to do in the Navy to earn a paycheck and full benefits.
After coming to work hung over for the third time this week, Airman Recruit Shmuckatelli lividly plastered the stall walls with "F.T.N." after he was ordered to swab the deck before he got the chance to recover from last night's party.