Or even, what the sigma?! Confused about what it might mean, or why kids are so obsessed with saying it? Here’s a quick breakdown of where the word has come from... Sigma is the eighteenth letter of ...

When I imagined life with teenagers, I seriously underestimated how much time I’d spend just trying to decode what they were saying (cracked? Sigma? Crash out?) and their cryptic emoji use (what does ...