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the act of being silly and serious at the same time.

a constant state of confusion.
Lori and Monica are being sillerious
by B87823 February 25, 2008
A state in which a person is both silly and serious at the same time
Did Leslie just double-sniff at me?

Ahhh yeeah that girl is extra sillerious today!
by D_Steezy May 20, 2011
Of being serious and silly simultaneously.
yeah, its a very silly programme but has some great storylines. Its a bit sillerious really :D
by Dug Stokes February 04, 2005
Becoming silly after becoming totally delerious, either through sleep deprivation or through a hypomanic episode.
friday night i went to electric, then lala, then back to electric, then blue bar, then a mates place where we all stayed up for around 30 hours no sleep. By then, we were completely Sillerious...
by Jason Kelton March 02, 2008