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Use "yoohoo" in a sentence
"SETI is not seeking messages -- a mere signal is enough (= "Ha!! you thought we were looking for neon signs that would read 'yoohoo'!")"
"This day my husband awoke from his bathtub reverie to a "yoohoo" from the kitchen and realized Mrs.B. had just invited herself in and there was not much between him and her."
"After the first period, again this bloody "yoohoo" came there."