"it was just part of an inside joke between me and a couple of close friends(both of which are black themselves)"
That's straight up you trying to get off the hook for saying a slur because you have black friends so it's okay.
You not posting the inside joke is telling us all we need to know. Me repeatedly saying it's a slur and you continuing to dodge the truth like, "But they just didn't understand the conteeeexxttt! It's not offensive with conteeexxxttttt! I didn't actually use it on anyone so how can it be offensive!" is just another nail in the coffin.
You had an offensive slur in your bio. They had a no tolerance policy and bounced you. You're whining that because it's just a haha le funny inside joke and not aimed at anyone makes it okay.
Sybau and take the L. The fact you're putting this much effort into it without just telling us what you said means you know what you did, you just want someone (a rando on itch.io) to pat your bottom and tell you everything is all right so you can feel validated about the meany Discord mods, but that's not the genius move you think it is.
Post another wall of text trying to justify this shit. Go on.