A place or thing that is immune to possums, or possums are not allowed in. Alternately can just mean impossible.
I am having a barbeque on friday afternoon, but don't anyone bring your possums if you were thinking about it. This will be an impossumable event.
by JJ's Garbage April 8, 2022
Get the Impossumable mug.commonly confused with impossible (not possible). Something so ridiculously preposterous that simply the thought of it causes you to loose speech skills and mispronounce common words
So you think you've done something to cause my feelings for you to change, that my dear is inpossimable!
by Fu_Matt_chu April 5, 2010
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