Mauritian slang for a pedophile. A krissun often makes high pitched noises and studies scientific subjects such as biochemistry. Extreme caution is advised if you see a krissun and you have children.
Kid: Mom, Dad who is that weird looking guy who keeps following us?
Mum: Don't worry son, he looks like a soodin (a tourist guide).
Dad: Oh dear god no, it's a krissun!! And he's after our son, RUN!!!