The Woozy Canary Gold Mine is a mine at Satan's Anvil
Bart, Milhouse and Nelson explored the mine while on a field trip. Bart found old naughty French Postcards and was prompted to look at them. Nelson then took the pictures and claimed they're "Fool's Porn". He looked at several of the pictures.
The name is a reference to using a canary to see if a mine is poisonous.