AN ICICLE PIERCED HIS CHEST!

pangur-and-grim : sometimes I read my own writing and I'm like "hell yeah that's actually cool", and sometimes it's just like…….what did I mean by this. what the fuck does this mean: like from the surrounding context, the guy is surprised by something and is experiencing palpitations. but why this metaphor? a bicycle pierced his chest. why? is this a typo? was I sick? am I stupid? AN ICICLE…