嗚嗚

(interj) boo hoo

wu̅ = w + Ø1

(onom.) for humming or whimpering

呜 = 乌 + 口 : Willy Walrus (w) is whimpering (呜) in front of the space station (Ø1) and the black crow (乌) consoles him by giving him a mandarin (口).

vuvuzela (horn) (loanword)

嗚嗚 currently does not appear in any sentence.