'See you later aligator' from the song of the same name.
Sometimes with other bits added -
'In a while crocodile'
'Too soon baboon'
Or from the kids - 'See you later aligator, don't forget your toilet paper.' They always thought it was hilarious.
Our family always had lots of these sayings, many of them not PC, especially from Charlie Drake. I think my Mum was the main culprit, tho' we added our favourites too.
Robyn