WhatsApp does not technically have a full form in the sense that it is an acronym or an initialism. The name "WhatsApp" is a play on words. It's a pun derived from the phrase "What's Up?" combined with the word "app," which is short for "application."
Therefore, there isn't an official expansion of the name WhatsApp into a longer phrase or set of words. Its origin lies in a clever combination of everyday language and tech jargon.
