The imaginary peace land of the potheads.
The place where all stonersmeet.
Dude man I am from planet Potlandania!
Smoking a doob...10 min. later...
Next stop: Potlandania!
Oana: Yo man... I am at Potlandania!
Inga: How'd you get there maaan?
Oana: I smoked a shitload of weed man! wan' some?
Pacific Northwest slang, traditional Puget Sound area, Eastern Washington, Oregon. A party. From Chinook Jargon "potlach", to give, a gift, an event where many gifts were given.