When a veteran infantryman would meet another veteran, the question would be asked: "Are you a turtle?". To which the challenged veteran would have to either reply "You bet your sweet ass I am!" or have to buy the challenging veteran a drink.
Marine veteran: "You bet your sweet ass I am".
NOUN : The actual act of doing a turtle.
NOUN 2 : Slang term for one who has done a turtle.
'A'ight, let's do this thang. No guns, no knives, no turtling.'
'I can't believe you wimped out on me! You're such a turtle.'
(Not to be confused with tortoise.)
Boy: I know, now let's go get some ice cream.