Shortened form of 'application.' Popularized by Apple
Computers Inc. with the introduction of the iPhone
. Mainly implemented because the majority of the Apple userbase is too retarded to even be able to use two mouse buttons, let alone pronounce a four syllable word.
Starbucks drinker: "I just downloaded this great app for my phone. It's called Super Monkey Ball! This is exactly why I love the iPhone!"
Starbucks employee: "I made the cream in your coffee."