I've always used the line 'ologist' when talking to my wife.
For example, she talked about fruit from the local farm the other day...and she was quite in depth. So I said..."What are you? A Fruit Farmologist?"
See where I'm going with this?
I used the term so much when my kids were little, that my 4 year old daughter at the time picked up on it. They were chalking on the sidewalk and I walked out and said... "Anne. What are you drawing there?"
Daughter: "Oh, I don't know Daddy...I'm not a chalkologist."
Oh man, I was floored! That night I even wrote it in her baby book!