Informal goodbye
(Other definitions for peace that I've seen before include "Accord" , "an answer to all clues, initially" , "''And I shall have some ... there, for ... comes dropping slow'' (WB Yeats)" , "Quiet - lack of warfare" , "still?" .)
(Other definitions for toodle-pip that I've seen before include "Take care" , "so long" , "Goodbye (dated)" , "Farewell (informal)" , "Farewell remark - dipole top (anag)" .)