noun
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.
(obsolete, derogatory) An exciseman or supervisor who measures with a dipstick.
(slang) The penis.
(slang, derogatory) A useless person of inferior intellect; a dipshit.
verb
(transitive) To check (a person) for their understanding of something, as of a lesson, or attitude toward something.
(mechanical engineering, transitive) To measure the level of a fluid using a dipstick.