dipstick

US /ˈdɪp.stɪk/
UK /ˈdɪp.stɪk/
"dipstick" picture
1.

a flexible rod with a marked end, used to measure the depth of a liquid, especially oil in a vehicle's engine

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Check the oil level with the dipstick every few weeks.
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He pulled out the dipstick to see if the transmission fluid was low.
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oil gaugelevel indicator
2.

a foolish or stupid person

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Only a complete dipstick would forget their passport on an international trip.
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He acted like a total dipstick during the meeting.
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foolidiotmoronduncenitwit