Exterminate is the sound a Dalek makes before it fires its Extermination Ray. So far, only two things have negated its effect: a fully-functional forcefield powered by an extrapolater; the Time And Relative Dimensions In Space, directed through Rose.
Dalek: Exterminate!
Snake: S***.
ZAP!
Dalek: Hasta la vista. BABY! EXTERMINATE!