Sidehilling 

1. Sidehill
When your girl is on all fours and your doing her doggystyle, knock one arm and one leg from under her and ride her sideways off the bed trying to stay on the bed as your riding her down.

"hey Heather, snowmobiling ain't your thing, we can try sidehilling.....tonnes of fun"

Sidehilling by K.Reeb February 1, 2005

sideballing 

When a drunk person is persistently looking at you out of the corner of their eye.

"Boy I could feel John sideballing me all night while I was talking to Bill, he's got to get over it!"

sideballing by BRC July 20, 2008

Sidewalling

A trail of shit left down the bowl of a toilet.

The Sidewalling game: Capturing a sidewalling with a picture and sending to all your mates. (more points awarded for the tail being close to the top rim. Points deducted for trails leading into the water)

Mike captured a fantastic bit of sidewalling art, After sending a pic to all his mate he received a respectable 9 out of 10.

Sidewalling by DogKRO March 13, 2010

Sideballing 

To look out the corner of your eyes at someone so that they "can't tell your looking"

I changed my radiator in the parking lot of the apartment complex. Noone said anything, but alot of people were sideballing.

Sideballing by Tug33 June 12, 2011