pipi /ˈpɪpi/ noun3 •(New-Zealand) The edible saltwater clam Paphies australis, of the family Mesodesmatidae, endemic to New Zealand.She chuckles, and prises another shrinking pipi from its shell. — 1983 •(Australia) The edible saltwater clam Plebidonax deltoides, endemic to Australia.The sand whiting feeds on nippers, pipis, prawns and especially beach, squirt or blood worms and all these make terrific baits. — 2006 •The astringent pods of Caesalpinia paipai, a Brazilian plant used in tanning. formspipis