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A plant, especially a tree, that defiantly grows in a place that it's not supposed to. Distinguished from a weed by growing in a extremely unexpected, unusual place. Commonly found on roofs.

Appeared in a Monty Python sketch:
"This is a wottle,
The emblem of our land
You can stick it in a bottle
You can hold it in your hand"
"Man, look at that wottle growing in your car engine!"
by shebaspider August 25, 2006
A water bottle
Those bottles work really well as wottles
by SquirrelMrrm October 03, 2010