When a girl says she'll text you later, and ages later she still hasn't but you don't want to call her or you'll seem like a desperate idiot. Suffered by desperate idiots and paranoid teenage freaks like me and the rest of my ragtag bunch of misfits.
I got bad txt-back anxiety when Emma said she'd text me later and she still hadn't like 8 hours later. Turns out she said 'I'll text you tommorrow'. Oh well, I'm an idiot.