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4.
when you have to take a dump, lay a few sheets of toilet paper before you take a dump. That my friend is the actual life boat. What the life boat does is protects you from the evil backsplash. I don't know about you but i HATE it when backsplash touches my anus.
Jerry deployed a lifeboat so not to get backsplash while taking a dump
by Seanye November 03, 2005
 
1.
1.
Another word for condom.

Make sure you get in a lifeboat before the ship sinks, hehe.

2.
The more usual definition of lifeboat is a boat usually stored on ships or deployed to rescue those in trouble at sea.

Boats stored on ships are used for passengers and crew to escape from a sinking ship, or perhaps to rescue someone who has fell in or been found in the water.
1.
Harold: I say old chap, do you have any lifeboats to spare? I am wooing Doris tonight!

Jack: Harry, I'll give you a lifeboat if you stop talking like that.

2.
Captain: Good lord, we're sinking! Get everyone into the lifeboats now!

First Mate: Sorry sir, we already deployed the boats to rescue Mr. Creosote...

Captain: Seven boats for one man? Are you insane?!?

First Mate: He's kind of fat...
by Zelda199 August 12, 2008
 
2.
A person in a relationship who keeps someone he dated or some who likes him on the side in case things dont work out in his current relationship, so that he can have another person to replace his current bf/gf
charlie always keeps a lifeboat just in case his relationship doesnt work out and he would have someone else to run back to.
by salitsa February 24, 2008
 
3.
A male or female you keep around in the case that you become desperate causing you to lower your standards and will go for anyone. You lead them on but never get anywhere with them unless they are needed. Also known as Playing
I haven't been with anyone in a while and I'm becoming desperate (ship sinking) but I have a back up plan to save me,(the person), I'll just go to my Life Boat.
by Santillean November 15, 2012
 
5.
An unsinkable poop which remains floating in the toilet even after multiple flushes.
"Dammit, that's the second time Pete's left a lifeboat floating in the toilet. Maybe it's his high-fat diet that causes that unnatural buoyancy?"
by ShedYourSkin December 25, 2009