Practical joke: To empty the contents of a backpack, flip it inside-out, then finish off by putting the contents back and zipping it up. Done when owner of backpack is unaware until later.
When he wasn't looking, I turtled his backpack.
by Kleetz March 30, 2006
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Turtle is a game that requires at least 3 people. In order to play one player must have the urge to pass gas. When he/she is ready to fart, the players gather a large blanket. The player who has to fart will stick his ass under the blanket and the other players will stick their heads under the blanket. While the aforementioned body parts are submerged under the blanket the lead player will then fart under the blanket. The game is as simple as follows:
The player who can keep his head under the blanket the longest to tolerate the smell of the fart wins. This is a gentleman's game so under most circumstances the fart will be done with clothing covering the bare bottom.
Person 1: Yo guys, I need to rip ass.

Person 2: You guys down to play a game of Turtle?

Persons 3 and 4: Of course! Grab your little sisters Cinderella blanket and let's play!
by Buffalo Blue March 24, 2014
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Verb (nautical terminology): to capsize, as in a boat, ship, or other sea-going vessel.
After a merciless bombardment by American dive bombers, the Japanese superbattleship "Yamato" turned turtle and sank, taking nearly her entire crew to the bottom.
by speedog July 27, 2010
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In video games it means two things.

For turned based strategy games, it means to keep your units together usually in or near their default positions on the map and use defensive tactics such as attacking only when the enemy is near you, using defend commands or other units to defend each other, etc.

In fighting games, it means to keep defending and block all of your enemies attacks untill there is an opportunity to strike.

Basically, in both cases it's using defense/blocking untill you have a good opportunity to make an action or attack your enemy.
"I just beat Nightmare Geese in Real Bout Fatal Fury! He was tough, but I blocked his attacks with my turtling skills and then attacked when I had the opportunity."

"In Front Mission in the 2nd or so battle against Driscoll's forces, I turtled and didn't move my units then attacked as soon as the enemy came near by"
by mikepantz012 November 11, 2005
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To be so upset or containing similar emotional distress that one avoids social contact and "hides in one's shell."
Isaac was so upset after his girlfriend dumped him that he decided to be a turtle for the night until he felt a little better.
by gloomhaven December 7, 2009
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