When my daughters were very young and couldn't read, I would leave notes on the table for my wife to read when she came home.
One day I left this provocative note on the kitchen table:
"Hey Hon, I'll catch you later for a Boff!"
My elderly Mother came over for a visit that day (I had forgotten about the note)...she read it and said,
"Patrick, what's a Boff??"
My face turned purple but I quickly recovered and stated with conviction..."Oh! Er...a Boff is slang for a coffee. I want to meet her for a coffee later today!"
Mother: "Oh, I see."
(Phew! That was close! But in hindsight it was quite funny!)