The Japanese Page has all sorts of resources for learning Japanese; I was particularly taken with the Gogen – Word Origins page:

折り紙つき origami tsuki
Meaning: something very nice; certified to be good
Example: このレストランのピザは、折り紙つきのおいしさです。
kono resutoran no piza wa, origami tsuki no oishisa desu.
this-restaurant-’s-pizza-as for-guarantee-’s-tastiness-is.
I guarantee you’ll love the pizza in this restaurant.
Origin: It actually has nothing to do with origami. This ‘origami‘ actually refers to an official document certifying the authenticity of a sword (刀の鑑定書 katana no kanteisho). The tsuki means the sword comes with this guaranteed certificate. This paper was folded and thus called ‘ori’ (to fold) ‘kami’ (paper). It is now used to refer to objects in general.

(Via plep.)

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