"soup the professor"--1902 college slang (query)

[Cohen, Gerald Leonard]

Would anyone have any idea about "soup the professor"? It appears in the 1902 article on college slang presented to ads-l by Benjamin Zimmer:

 'A student who endeavors to get a high stand mark by favoritism is said to be "souping" the professor or "bellyaching" an instructor.'

Gerald Cohen

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