1. When you are driving, you go into Scotch Overdrive when you shift into Neutral. (Saving fuel, being a pinchpenny.)

2. Trying very hard to save money, to the point where you annoy others with your cost-saving antics.
1. We were cruising downhill on Main Street when he went into Scotch Overdrive.

2. Contractor went into Scotch Overdrive - sent us on a 5 mile detour just for some cheaper nails.
by ecdthefirst May 16, 2006
Get the scotch overdrive mug.