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.

[glossary]