Dipsticks

noun

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.

   "I haven't checked the oil level of my car's motor since I lost the dipstick three months ago."

2. A penis.
3. A useless person of inferior intellect; a dipshit.

   "That referee is a right dipstick."