1. the act of being seriously silly
2. the art of making something serious silly by brilliantly mocking it
3. being super serious about something silly, like politics.

see also: silliousness
"Funginears! Stop being so sillious!"
"Obama is just another political puppet, silliously!"
by kallisto concoctions 2011 December 24, 2011
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Adjective; the opposite of serious; Unintentionally acting or speaking in a silly manner in a serious context.
Timothy: hey mark, if you could have any car in the world, what car would it be?
Mark: idk man, probably an Infiniti G37.

Timothy: hahaha… wait are you sillious?
by Milkman320 June 30, 2022
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