It can be used in a non gay (or non-hetro way if you're gay) to friends, family and any loved ones. AND AND AND it can be used in the most sexual way imaginable. It's a versatile word that has so many deep and meaningful meanings.
I Duku you or Duk you
Duku good night
Duku my good chum, let's meet up again soon.
2. Word used by Alan Alcock ($Arab Money$) to describe lukus in a way that would piss him off.
Ricky: Hey dukus.
Joshua (dukus) Whatsup ricks
Alan: Hey DUKUS!!!!! ahuuurgh ahuuurgh ahuuurgh (laugh)
Lukus: Gaddammit alan
You remember bein with that girl last night, her face was lookin pretty duku bro.