Someone from Hello Online made this ages ago.
It’s a capture from Ayaka’s Surprise English Lessons, where Kimura Ayaka from Coconuts Musume would ambush members of Morning Musume and teach them useful (or not so useful) phrases, and usually reward/bribe them with desserts.
[youtube=http://www.youtube.com/watch?v=qXj6RnaK4Pw]
Here’s the episode it came from. Ishikawa Rika was learning about the word “muggy” and got a bonus lesson in useful slang.