Meaning of -EROO in English
a suffix that creates familiar, usually jocular variations of semantically more neutral nouns; normally added to monosyllabic bases, or merged with bases ending in -er: flopperoo; smackeroo; switcheroo.
[ of unclear orig.; perh. extracted from BUCKAROO, though this word appears to have been conformed to a preexisting suffix (or word), the stress and final tense vowel being otherwise unaccounted for ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012