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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Used in Hawaii as a slang for 'thirty' when telling time.
John Doe: What time you start tomorrow?
Jane Doe: Oh, five turtles, you?
John Doe: Nine turtles, but I get of at 3!
by Kalikus808 January 10, 2011
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to knock out an obese person and they fall on their back, the sleeping "turtle's" back fat makes them rock side to side
did u see that fatass get turtled? he was out cold rockin side to side!
by TMNT Splinter November 26, 2011
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Used instead of "thirty" when saying half past the hour.
friend 1: What time is it?
friend 2: It's three turtles.
friend 1: Thanks.
by maryJAHne November 3, 2010
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They’re the best little dudes on the planet. People need to start loving my little bros more. Come give them hugs. BUT DONT CRUSH THEM. K thanks that’s my ted talks. Bye.
billy: look at that little turtle over there!!
Camryn: they’re honestly the best people need to start loving them more *rolls eyes**
by imma.salty.frenchfryyyy. April 25, 2019
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