Double lock 

The act of locking your bedroom door and locking your bathroom door before beginning masturbation

I always double lock before I rub one out don't want my rommie to see my dick

Double lock by TheOnlyOne August 16, 2012

Triple Lock-Knot Double Back Rocket 

This knot was discovered in the Lawn Care industry of western Pennsylvania for securing equipment on a trailer. The knot is comprised of three inter-locking loops to tighten the slack out of the line and two slip knots (know as the double back rocket) securing the locked loops. This is a very secure, but easy knot to untie when access to the secured object is needed frequently.

We have a long ride from Moon to the Rochester Beaver run, you better tie the Triple Lock-Knot Double Back Rocket to secure the walk behinds.

Triple Lock-Knot Double Back Rocket by TLC_Baby October 10, 2008

Double Door Locker 

The same as a door locker, but used when the door has an automatic lock like a hotel door, or cruise ship cabin. The bolt is used in addition to the automatic lock.

Fuckin' Mike is such a Double Door Locker. He locked me out of my own cabin, and I had to sleep in the hallway.

Double Door Locker by MBL January 4, 2008

Double Land-Locked 

(verb) also: double land-locking Tower Bridge, but with an extra layer.

K: hey bruh, did you get double land-locked yesterday?
J: yeah man, still a bit sore.

Double Land-Locked by William Shafner November 15, 2017

Double Smokey Ball Locker

While in a locker room, a woman inhales a cigarette while holding in the smoke two guys insert both sets of their balls into her mouth. Then the woman exhales the smoke out of her mouth and nose covering the balls and penises.

After the big game, the head cheerleader gave the quarterback and the running back a double smokey ball locker.

Double Smokey Ball Locker by IBPANTERA November 3, 2012