1.) the act of transitioning from verbal docility to verbal hostility very quickly.
2.) In a mini-van; driving with both rear-sliding doors ajar so as to avoid heat-seeking missiles from terrorists.
Customer Sales Rep: "...I can provide transportation for $20/person. Admission will be $15/person."
Dude making call: <stunned silence>
Needless to say, "dude making call" would follow this silence by going chopper.