I spit a lot while running, I snotter a lot while cycling. Move to the side, check there's nobody too close behind you, honk it out. Wipe your nose with your hand, wipe your hand on your shorts. I don't care if snot rockets aren't ladylike and I don't care too much if they disgust other people. I figure, as long as I don't actually spit at or on anyone, it's really their problem not mine.That said, I do try to be reasonably discreet about it. One of the guys in my running club is an expert snot rocketeer and can fire bogeys a spectacular distance. I'm rather envious of his talent.