1. too much nipple sucking/fondling during sexy time
2. shreddin' all day and in most cases on a surfboard that has sand rubbed in with the wax, thus making your nips chapped and rough like a dry twat. this fucking hurts, you fucking mung scooper.
fucking jeffrey-"your a faggot, man, has ann been sucking your nipples again? I told you it's the other way around, you're supposed to suck hers"
chester-"no dude, not this time, I surfed all day today and my nips are bloody like your moms vagina at the end of the month"