I had to look up nacker to see that it meant gypsie haha
It's not so much.. gypsie where I come from.
A nackertache is just the name some of us have given to that particular moustache.
A nacker would be... erm..
Nacker:
Like the English chav only irish
Live in city
Rude,dangerous, poor white trash.
You'd really have to be irish or live in ireland to understand fully.