Sneakasack

The act of sneaking up behind someone, throwing a large cloth over them, tying the ends together and proceeding to drag them around while tied up

tevin just got sneakasacked by clay... it was uber funny

Sneakasack by captainslapaho January 11, 2011

sneakback 

Episodic sex with an ex long after the break up.

I always break up amicably so if my ex is ever lonely and horny, she'll call me for a sneakback rather than doing a new guy and adding another notch on her belt.

sneakback by boutsos May 23, 2005

Sneakajack

The action of covertly masturbating with others around. Most commonly perpetrated by individuals taking part in a point based masturbation game. The more unaware individuals around when sneakajacking the more points received by the sneakajacker.

"The secret service failed to thwart my sneakajack while I was sitting inside the podium while the president gave his last speech about the war."

Sneakajack by SheriffKLap August 31, 2013