Developing slang for Destiny: Triumph of a Spellbinder

Developing slang...

Well, I've developed a few slang words for the final chapter in my Ragnarok Rising trilogy and I've become a bit conflicted on one particular slang word.

First, let me explain. The protagonist for this story is eighteen and I figured that he and his friends would be much more prone to using slang words than other previous characters. So I developed some terms like splurged, thatched, maer, frizz, and Rekk.

My main issue is with the word 'Rekk'. Basically it is an Anglicized version of the Old Norse word 'rekkr' which means man. My issue you ask? I've come to find the term annoying.

The word is used more or less in the same way that people use the words 'dude' or 'man'. For example, 'Rekk, are you alright?' is a sentence muttered by one of the characters early on in the story.

I'm tempted to remove all trace of the term, but I'm conflicted. Should I replace it with something else? If so should I develop a new slang word or should I use 'Man' or 'Dude' instead.

Oy vey