A homoerotic sexual act involving multiple partners. While performing the double linked list, each partner inserts his penis in the anus of the the partner in front and caresses the testicles of the partner behind him.
The effect is similar to that of the double linked list data structure.
When your womans breast are so big you can press both nipples together and lick or suck those babies at the same time. She loves it when I pull out those 36DDD and give her the Double Nipple Licker.
When you're being a little bit of a dick, perhaps even unintentionally, and in order to point it out to you someone is way more of a dick than you were in the first place.
"I posted on my facebook wall that I'm looking forward to moving to New Orleans and leaving San Francisco, and homeboy got offended and commented 'Oh yeah, you're sooo much better than everyone in San Francisco.' He totes doubledicked me."