An Innocent boy is commonly used Galway or traveller term to describe a person who is;

1. afraid to take a risk(often referred to as a pussy).

2. a posh, upper class individual who says large words or dresses like a rich person.

Innocent boy is also used as an insult to describe one's hatred or disgust at some ones actions or appearance. Usually in this case will be used by a chav or a traveller.