A measuring device that every man has to measure the length of his penis. Could be a ruler, a yardstick, or something else with a predetermined size. Rarely seen or admitted to, but in the possession of most men.
The act of inserting an erect penis into a menstruating girl's vagina to check for blood similarly as one would check for oil in an automobile. It is also a good way to measure the depth of a woman's vagina. If a large enough man measures his own length prior to dipsticking, the amount of "oil" on his penis post-dipsticking will determine her depth.
Remember that during dipsticking it is important to wipe the dipstick off before you check for oil to yield sufficient results. It's got to be clean, and you have to give it a good swab."
-The latter, has in fact been attempted with satisfactory results.
A person who owns more knives than years they have been alive, enjoys waving their fingers in the air while intoxicated, and is more proficient in knowledge and skill in any number of hillbilly weapons. This type of a person will quickly express his "abilities" for any activity if given the chance, and is better at anything than you are.
Me: Did you see that guy drive out of that police take down maneuver at 100mph!?!
Some Dirtsack: Aww that's easy, yah just shift it into neutral and get control of the wheel.
A sexual/alcohol-related act akin to the infamous buttchug. When performing a Mexican Dipstick, one party will soak their finger in tequila, and gently insert it into the anus of the other party.