"I often nod my head and agree and say, kein yirbu!" (source)

"Our population - keyn yirbu - has multiplied ten-fold, while Jewish communities worldwide have withered." (source)

"May all Yiddishe parents, grandparents, great-grandparents, etc., raise beautiful Yiddishe families, keyn yirbu, and continue to shep only nachas from all their descendents!" (source)

"Shoshana's had another baby? Her third? Mazel tov! Ken yirbu!" (Glinert)