First a translation:
In danish "onkel" means "uncle" and "dunkel" means something like "sinister" or "dark". So "Onkel Dunkel" means something like "the sinister/dark uncle).
The reason:
My sister had a kid a little less than 2 years ago and therefore i was going to be an uncle. Now my nature is that when i know people really good i begin pretending that i?m a lot more evil and badass than i really am (for fun, hard to explain). I?m actually a really nice guy (one of those "soft men" you know

). So because i was going to be "the dark badass evil uncle" my wife called me onkel dunkel in fun because the real me couldn?t be further from it. But hey, it?s "nice" to pretend to be evil
