The name is derived from the pogo stick.
Optional: Failing arms, kicking, thrashing, banging into people, and grinning like an idiot, or keeping arms and/or torso stiff and bouncing like a pogo stick.
Although it can seem violent to an outsider, pogo is all in fun - nothing to do with aggression - and though people occasionally get injured, those who fall are often helped up instead of being mashed by poser combat boots. It's a general understanding between concert-goers.
"I may be ten years old but I still know what's up
I wear my Cramp shirt almost every single day
I wanna sag my pants, I wanna pogo dance
But mom won't let me so I might just run away"