To be completely serious; not joking.
Suzie: Matthew likes you.
Sarah: Stop joking around, that's not funny.
Suzie: I'm dead serious.
by BellaW December 26, 2008
Top Definition
To be completely serious; not joking.
Suzie: You don't have an ass.
Sally: Stop lying.
Suzie: I'm dead serious.
by BellaW January 04, 2009

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