nipple mouse
n.
Var. clit mouse, clitoris Common term for the pointing device used on
IBM ThinkPads and a few other laptop computers. The device, which sits
between the `g' and `h' keys on the keyboard, indeed resembles a
rubber nipple intended to be tweaked by a forefinger. Many hackers
consider these superior to the glide pads found on most laptops, which
are harder to control precisely.