Top Definition
a disease similar to tourette syndrome...however this disease is defined by irrational behaviour and/or speech...

to act like Sidsel
Sidsel went all sidselitis on the guys for mocking her driving skills and not giving proper directions. The guys were wary of their words for the remainder of the trip, for fear that she'd go sidselitis on their ass again
by Sidsel's friend April 23, 2004
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