dipstick

Meanings

1. A stick or rod used to measure the depth of a liquid. Often used to check the level at which a liquid in an opaque or inaccessible tank or reservoir stands; gauge.
2. An exciseman or supervisor who measures with a dipstick.
3. The penis.
4. A useless person of inferior intellect; a dipshit.

1. To check (a person) for their understanding of something, as of a lesson, or attitude toward something.
2. To measure the level of a fluid using a dipstick.

Etymology

From dip + stick.