1. acting rapidly in a highly agitated way

2. 60 miles per hour

Sixty Miles an hour.

Also used to describe a rappid dispursal of oral information as a means to slow it down.

An extremely fast pace.

Uh, Sixty miles an hour? Der!

This slang is when something, usually speech, is going very quickly.

The velocity of 60mph. Duh. hehe. An alternative expression to the aforementioned definition.

moving at an extremely high speed to keep yourself up to date with things, in the centre of activity

a killer plant (Mikania micrantha) that is destructive to other plants. Native to Central and South America, the plant grows three inches a day and can climb on any type of plant, forming a canopy overhead. This would block sunlight and stifle the photosynthesis process of the plant, thus ultimately killing it. As the plant spreads rapidly, it is appropriately called a mile-a-minute vine.