What is a shout out?
It is a public acknowledgement, mentioning someone's name during a public appearance or interview.
Talking very loud
Saying Hi to someone. ie; if you're on TV you would say "A shout out to my peeps in BS U.S.A" get it?
When a penguin wears a diaper
Yelling at your siblings
when people say something you like and did it you would say their username to the video or thing that your making
Oh Gosh, Sarah Palin did these all the time. Glad people forgot her already!