This should explain the rather obscure meme. (urbandictionary)
2. Sea Turtles 6 up, 1 down
When something inexplicable happens, or you don't want to explain something, you can use "Sea Turtles" as a stand in.
'Teague beckons forth the dog with the keys, last left on the cannibal island'
Ragetti: Is that... can't be.
Pintel: How?
Captain Teague: Sea turtles, mate.
Kimi wa ne tashika ni ano toki watashi no soba ni ita
Itsudatte itsudatte itsudatte
Sugu yoko de waratteita
Nakushitemo torimodosu kimi wo
I will never leave you