DOODLEBUG
doodlebug, ant lion, antlion
(noun) the larva of any of several insects
doodlebug
(noun) a small motor vehicle
Source: WordNet® 3.1
Etymology
Noun
doodlebug (plural doodlebugs)
(informal, British) The V-1 flying bomb.
(informal) A term of endearment.
(entomology) An antlion larva (Myrmeleontidae).
(historical, "doodlebug tractor") An automobile converted into a cheap tractor for a small farm during the Second World War.
(informal) A slackard or time-waster.
(informal) An idiot.
(informal) Someone who draws constantly.
(informal) A divining rod or similarly intended device.
(obsolete) Individual self-propelled train cars.
(regional, entomology) A woodlouse.
Source: Wiktionary