Definition of "propper"

Baby proppers pose dangers. The latest information on the relationship between baby positioning and SIDS has led to a multitude of new products designed to prop babies on their sides or backs.

1999, Sandy Jones, Guide to Baby Products, page 58

I do not mean that she stood around in the road, but she moved in a world of business men, golf-club bar proppers and night-club hounds, who certainly regarded her in this light.

1973, Iris Murdoch, The Black Prince, page 47