toot (v.) Look up toot at Dictionary.com
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.
toot (n.) Look up toot at Dictionary.com
1640s, from toot (v.); meaning "cocaine" is attested by 1977.