Someone who meets two requirements. Firstly, being exceedingly attractive, and secondly being exceedingly cool. Someone who is a hotsicle, typically has lots of friends who admire him/her (or alternately are envious of him/her). Any guy or girl in a relationship with a hotsicle tends towards being very lucky in the short term, but runs a risk of being extremely unlucky in the long term, as hotsicles also generally are not the brightest people around, and lack key principles where relationships are concerned.

Literally everyone, ever. Including the writer of this definition.