leg man
leg man {n.}, {informal}
1. An errand boy; one who performs messenger services, or the like.
Joe hired a leg man for the office.
2. {slang}, {semi-vulgar}, {avoidable}
A man who is particularly attracted to good looking female legs and pays less attention to other parts of the female anatomy.
Herb is a leg man.
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Source: A Dictionary of American Idioms