Toot

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early 16th century: probably from Middle Low German tūten, but possibly an independent imitative formation.

wiktionary

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Probably onomatopoetic in origin, compare Dutch toeteren(“to blow a horn”) and German tuten(“to blow a horn”).

Perhaps a contraction of toilet.

etymonline

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toot (v.)

c. 1500, of horns, ultimately imitative, also found in Middle Low German and Low German tuten "blow a horn." Related: Tooted; tooting. Tooting as a strong affirmative (as in you're damned tootin') is attested from 1932, American English. Reduplicated form rootin' tootin' "noisy, rambunctious" is recorded by 1924.

toot (n.)

1640s, from toot (v.); meaning "cocaine" is attested by 1977.