double en-tundra Share definition Flag 1. A horrible pun told above the tree-line. 2. The kind of joke that gets you beat up. "We pined for new jokes as soon as we got above the tree line, but we were already in the double en-tundra." double en-tundra by Tyler Morell April 9, 2008 0 0 Get merch Get the double en-tundra mug. Buy Now — $32.95 See more merch