When a male has nuts so big they swing around the shaft of the penis.
Hey Lisa, wanna see my tetherball pole go all the way around?
Based on the sitcom "Seinfeld" after Newman, who is Jerrys friend rivalry. It is when you put your fecal matter into a mailbox as joke, making it a dirty Newman
"man, I need to get Troy back for what he did to me last week"
"Oh dude you should just slip him a dirty Newman"