When you let a little bit of shit come out, and then squat over someone's face, smearing your shit around a bit.

Then withdraw the poop back into your ass, like a shy turtle.
When Matt and Nick were younger, Matt used to shy turtle Nick in his sleep.
by River and Hannah May 4, 2009
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When one of your close friends acts shy around you for no appearent reason

Make a fist, Poke your thumb out of the middle of the four fingers and slowly withdraw it.
"Sonny sits at our table everyday but doesnt say shit"
"Thats a shy turtle"

Make a fist, Poke your thumb
by Wooplah April 25, 2009
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A shy turtle is the awkward occurrence of a terd that pokes its head out of the anus (shell) but then pulls it in readily at any attempt to defecate it. As a result, this means visiting the dunny numerous times with no apparent luck.
Bob: Geez Billy, you eat some bad curry last night?
Billy: I wish Bob, I’ve been wrestling a shy turtle all morning and can’t catch the mongrel
by Grad2000 March 9, 2011
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When a male's penis shrinks to the point of almost going back inside the cavity from which it came. The balls act as a visual representation of the tortoise shell and the head of the penis as, you guessed it, the head of the turtle.
Man did you see Hank's wiener? It looked like a fuckin shy turtle!
by BSuraci October 28, 2006
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When males' testicles or balls or gonads retract and shrivel. Sometimes due to cold or excitement but primarily in this case due to fear and anxiety.

Like two little turtle heads, connected by skin and sinew, pulling back into its/their shell.

Metaphorically similar to a poo shy turtle but technically, physically and emotionally a very different experience.
She was fun, interesting, sexy and his friends wanted to bone her, but the fact that she was clearly cleverer than him gave him a siamese shy turtle. Would she notice? Would she care if she did? Or, does the fact that even imagining approaching her makes his body eat his balls mean that he'll never have the courage to get close enough for his shriveled sack to matter?

"You know that Bobbitt story, right?"
"Awh, man, don't maaan. Giz me a siamese shy turtle just thinking about it"
by RastaVari October 23, 2013
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