A fork of Rural Dictionary
To app is to appreciate something, usually an extremely witty pun or a great joke. It is short for appreciate, but it is awkward for one to say, "I appreciate that" after every witty thing someone says. Extreme apps can be applied, for example, jokes about the decline and fall of the Roman Empire should be apped times a million.
"Insert something suttle or witty here"
"LOL! I app that times a million!!!"