Definitions by Semny.

Collin 

When somebody is so hot they pretty much pass the laws of hotness and head into a whole other dimension of mouth watering, knee shaking, mind jellifying goodness. Embodiments of this definition are often referred to simply as Collin.

Girl One: 'That boy is so Collin it's unbelievable.'
Girl Two: 'I know. He's amazing. Look at him go.'
Girl One: 'With pleasure.'

'Yeah, he's a Collin'

Collin by Semny. November 2, 2009