The fan-shaped patch of hair just above a guy's butt.
He's got as much hair on his fantail as he has in his crotch.
by Evan69 August 15, 2010
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The act of fooling yourself into thinking you've had a great time at port whithout actually leaving the ship.
Step 1 : At at the fantail of the ship, toss $100.00 overboard.

Step 2 : Drag your dick across non-skid deck.

Step 3 : Bang your head against bulkhead until you pass out.

Step 4 : Wake up out of $100.00, sore dick, terrible headache, and you'll think you had a blast on liberty!

-Fantail Liberty
by BlackCancer October 23, 2009
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Luxurious form of male masturbation.

Step 1: Take off/drop pants or unzip.

Step 2: While standing, raise your leg onto a bench, chair or small stool.

Step 3: Reach under the raised leg. Taking a firm grip of The Penis.

Step 4: Maintain ringlike grip on The Penis with thumb and forfinger. Fanning out remaining three fingers.

Step 5: Rub it out. Maintain Fan.
Example 1
Matos: What's up Stef, your looking blue?

Stef: Man, cranking just isn't hitting the spot anymore.

Matos: Dude, just start pumping Back-Hand Fantails, it's like your knob won the lottery.

Example 2
Hayden: Yo, what you up to tonight Big Mattress?

Matt: Just popping off Back-Hand Fantails.

Hayden: Living large!
by M Dogg Diggity April 28, 2009
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A guy or girl who has a stupid hangin on their nuts..

Dude that beoch is just a faintail.
by Anonymous July 27, 2003
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