The act of refraining from much activity. Not doing much at all.
"What are you doing?" - "Not much, just dickin around".
"I was dickin' around the other day and saw a white dude get the beat down"
The act of wasting time or doing a purposeless act.
Person #1: Man I just failed my exam!
Person #2: Why? the teacher gave us the answers to the test to memorize
Person #1: I was way too busy dickin around on facebook until 4 AM to learn them.