(adsbygoogle = window.adsbygoogle || []).push({}); what is this ''easter egg''? how to do it?

easter egg = an unexpected or undocumented feature in a piece of computer software or on a DVD, included as a joke or a bonus.

...mmmmmm:/ i m a noob man! i see alot of post like i search peoples for do easter egg???

Just check out youtube bro, there are a lot of videos.