shitify the air

1. Bend over so you're on all fours.

2. Relax your muscles and allow your asshole to "gape" and let air in.

3. Squeeze the air out by tightening your muscles.
4. Repeat from step 2

This should "shitify" the air by making all the air be air that was in your ass.

example 1:
me (on the bed): *shitifing the air*
my gf (at her desk, hearing me): STOP SHITIFYING THE AIR!

example 2:
me: *on all fours on the bed)
my gf: i know what you're going to do, don't shitify the air