The sound comes from Cha Cha Slide, the line dance track released in 2000 by Chicago DJ Casper, also known as Mr C The Slide Man. The song gives step by step instructions, and criss cross tells dancers to jump and land with their legs crossed. It became a staple at parties, weddings and school events before clips of its calls started circulating online as short meme sounds. The criss cross section works on its own because the instruction is visual, catchy and easy to apply to any sudden switch or jump cut.