1 definition by Tyny1979

Thumbscope

When doing a chick doggy-style and you are too drunk to find the hole, you use your thumb as a marker. Put your thumb in the hole that you want to go into and use it as a guide for your penis. Also works well in the dark.

I was so drunk I had to thumbscope that chick just to find the hole.

by Tyny1979 February 5, 2010