Basically like zoning out, but on purpose. Tuning out your surroundings, simply because they are not worthy of your attention.
Eliot: Dude, did you not hear me justtell you all of my most intimate and vulnerable secrets?
Tanner: Nah bruh, I've been boxin' for the last four hours.
When a girl wants to chat up a guy but also wants to play hard-to-get at the same time, she just says "Hi" in facebook chat, and guy will "take over" the conversation from there.
Samantha (on facebook): Hi Dick (on facebook): Oh hi samantha, how are you?
* silence *
Dick (on facebook): Pretty boring day huh?
* silence. Dick, sensing a faceping prods on *
Dick (on facebook): So, any news?
Samantha (on facebook, faking disinterest): meh