Tofugu is approaching perfection little by little every day.
Unfortunately, Koichi has a perfect alibi.
Oh jeez! Now you’ve completely distracted me. What was it that you wanted to talk about... office dog, was it?
When something is all perfect it is complete. Not only that, but it's perfect (because it's ALL perfect, not just partially so).
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.