Top Definition
Someone who spreads grumpyness like a fungus. Usually a gross, annoying person.
Danielle is such a grumpfungus, seriously she just puts me in such a bad mood.
#grumpmuffin #grump #grumpfungi #fungus #grumper
by GRUMPFUNGUS September 23, 2009
5 Words related to Grumpfungus
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