Someone who drinks greedily or in large amounts, or a vehicle that uses a lot of fuel quickly.
From 'guzzle' (to drink greedily) plus the agent suffix '-er' (one who does the action). The term was extended to vehicles in the 20th century, particularly in the phrase 'gas guzzler' for cars that burn fuel rapidly.
The phrase 'gas guzzler' became super popular in the 1970s during the oil crisis when people suddenly cared about fuel efficiency—it's the same word for a greedy drinker, just applied to hungry cars! Language adapts quickly when society faces new problems.
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