too·tle /ˈtutḷ/
輕吹,嘮叨(vi.)輕吹,嘮叨(vt.)嘟嘟地發出
Too·tle v. i. [imp. & p. p. Tootled p. pr. & vb. n. Tootling ] To toot gently, repeatedly, or continuously, on a wind instrument, as a flute; also, to make a similar noise by any means. “The tootling robin.”
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tootle
n : sound of tooting softly and repeatedly as on a flute
v : toot continuously; "tootling car horns"