Slang or humorous term for a bulldozer or heavy earth-moving equipment; a play on words combining calf with dozer.
A playful compound created by combining 'calf' with 'dozer' (from 'bulldozer'). This appears to be modern slang or industry jargon rather than a historical term.
This is exactly how modern worksite slang gets created—someone probably joked about a small bulldozer handling 'calf-sized' jobs, and it stuck in a community!
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