Siderailing 

Performing oral sex by not putting the penis inside the mouth, but rather licking it's whole length from the side.

Getting siderailed (siderailing) by two chick simultaneously - twice the pleasure.

Siderailing by 911tracks September 18, 2018

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

sidetailing 

When a female dog or cat is in heat or attracted to a male they will turn the tail to the side, showing the genitals as a gesture to show they are interested sexually. Men will use this term with other men when they notice a woman checking them out or being slutty.

"Hey man, that chick over there is totally sidetailing"

sidetailing by redeyejedi2009 July 24, 2009