Top definition
(n) A luminous mushroom; A user of Facepunch with 60 thousand hobbies.

Sometimes spelled as Luminoushroom when describing an illuminated mushroom, not a lumen (Measure or light) added with a mushroom.
That lumenshroom was delicious. Hopefully it wasn't radioactive!

Lumenshroom is showing us ANOTHER hobby.
by Lumen June 19, 2008
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