Creeper speed 

noun, the speed at which your automobile, bicycle or legs move at to make sure you get a good look at something or someone. Usually around 2-mph.

Alex; why is that car going so slow?
Aaron; thats creeper speed man.
Alex; what a perv.

Creeper speed by abwoitas October 10, 2010

Speedy creeker 

An old person that walks suprisingly fast for their age.

“Grandma is turning 85 this year but she moved like shes 20 what a speedy creeker”

Speedy creeker by TheBigOneInyourMom July 20, 2018