The weather is suitable outdoors for the activity you want to participate it. Sunny for a walk or a swim. Snowing for sking. Windy for sailing. If it's the weather you want outside then for you it's outdoorable.
"Oh look, it's outdoorable. Bring your coffee and let's sit in the sun."
"There's a good wind coming up, perfect for windsurfing. Yes finally it's outdoorable."
Any indoor item that can be used outdoors without getting ruined by the elements.
Me- I'm going to go get my favorite chair to sit on outside with you guys.
Them - what? you're favorite indoor chair? Won't it get ruined and dirty?
Me- No! It's OK, it's totally outdoorable.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).