Top Definition
Someone who is extremely picky about all things sustainable. Will call other people on their unsustainable behaviour. Combination of sustainable and anal.
Mike is so sustainal, he criticized me for throwing my banana peel in the wrong bin.

Stop being sustainal, Mike, get a life!
#anal #sustainable #green #greenie #mike #global #warming #al gore #granola #overpopulation #recycling
door R-NO 27 april 2010
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