Definitions by BellaW

Dead Serious 

To be completely serious; not joking.

Suzie: You don't have an ass.
Sally: Stop lying.
Suzie: I'm dead serious.

Dead Serious by BellaW January 4, 2009

[dead serious] 

To be completely serious; not joking.

Suzie: Matthew likes you.
Sarah: Stop joking around, that's not funny.
Suzie: I'm dead serious.

[dead serious] by BellaW December 26, 2008