Thanks all. This was the full hand:
I held the North cards. I decided against pass because I felt LHO might be loaded with diamonds and pass this. Afterwards he said he would indeed pass 2
♦. I didn't dbl because I wasn't strong enough to pull pard's response to spades, especially with that moth-eaten suit. So that seemed to leave me with an off shape 2NT. Here's what followed:
(2
♦) ...
2NT 3
♣ (puppet)
3
♠ 4NT
..??
Pard intended this as quantitative, but it is actually RKCB for spades. Even if it were indeed quantitative, that would be WILDLY optimistic (I told you he overbids lol).
As to what happened in the end, I'll spare you the details. Suffice to say chalk +1 to the multi. Or rather +55 cross-imps