"To whatsapp" is a common verb, but I have never heard anyone say "apping".
replyWhere do you live where "apping" is understood?
Can confirm that it's an extremely common verb in The Netherlands.
replyHeard it many times in the Netherlands.
replyReminds me of the old joke:
replyAfter Bill and Melinda Gates have their honeymoon, Melinda says, "Now I know why you call it Microsoft."