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3.
Horrible, bad insult
Dude... stop being such an hippopotomonstrosesquipedalians
by Johnny G. April 06, 2005
 
1.
Pertains to a very long word.
Antidisestablishmentarianism is exceedingly hippopotomonstrosesquipedalian, but cannot compete with floccinaucinihilipilification.
by Ivor Biggen March 29, 2004
 
2.
A really long word that defines really long words.
We learned about Hippopotomonstrosesquipedalians in school today.
by bob izzle May 09, 2005