A long time ago a roommate of mine had a baby, and as he came of age all of our friends took it upon themselves to make their introductions as Uncle This or Aunt That. I remembered how confusing that was for me as a kid, so when Mom eventually spoke up on the matter I offered her Frunkle and Fraunt as an alternative title.
I don’t talk to her anymore but I do sometimes wonder if she’s still using that word.