Noun
A rainbow that appears to be doubled because of a visible secondary rainbow (caused by a double reflection of sunlight inside the water droplets) at a greater angle than the primary rainbow.
(Can we verify this sense?) (informal, sometimes derogatory) The LGBT community.
Source: en.wiktionary.orgAlso of delicious note were the uber-thick milkshakes made with Double Rainbow ice cream ($5.99) in a half-dozen flavors. Source: Internet
As you see in the photo I've been exploring all kinds of flavors (clockwise, starting from the top left): my Homemade Swanton's Strawberry Mint Chip; Swenson's Chocolate Chip & Mint Chip; Double Rainbow It's A Goody and Swenson's Mocha Fudge. Source: Internet