> "App" does not rhyme with "Up".

It does if you're from Boston.

But if you had heard people saying it like this for years https://www.youtube.com/watch?v=JJmqCKtJnxM

https://en.wikipedia.org/wiki/Whassup%3F

Sure, but there are countries where the accent of people speaking English makes the pun very obvious. I wonder if the original WhatsApp people were foreigners.

Same, and I just figured it out NOW. And I use it every day....