A giant centipede that shoots fluid that makes your skin rash?

2 things you may be thinking of here:





1. The velvet worm, which shoots a glue-like substance over a distance at its victims before devouring them:


http://en.wikipedia.org/wiki/Onychophora





2. Millipedes, which can emit noxious chemicals as a defence mechanism:


http://en.wikipedia.org/wiki/Millipede|||Omg, you found my Fluffy! I thought I had lost him forever!|||thrum