A duo of guys in England that are mostly known for helping The Super Flash Bros. The members of Double Helix are: the founder, JT, and Dan.
The group was created when they participated in a Newgrounds Flash collab, "The Matrix Has You" (the name isn't in the list, but they still participated). After that, they started helping The Super Flash Bros with the Decline of Video Gaming series.
Double Helix... Decline of Video Gaming 1/2/3... ho hum.
Double Helix is the situation, commonly referred to as a game, in which two semi-erect men twist their dicks together to form what resembles a DNA Double Helix hence the name "Double Helix."
Greg: Hey John, wanna play double helix?
John: Let's do that! Let's do exactly that!
<game of tummy sticks ensues>
John: Shit! I hate it when I get my Schartz twisted.