The phrase 'Omochikaeri' means 'I'm going to take you home.' or 'I'm getting you for take-out.' This phrase is used by Rena Ryuugu of Higurashi no Naku Koro ni, one time Keiichi, and some times that weird pedophile doctor of Satoko's and Rena's that I forgot what his name is.
Natelie: LOOK AT THIS PUPPY!!
Puppy: *kawaii looking* :3 Anna: O_O OMOCHIKAERI!!!