Yah-boo /ˌjɑː ˈbuː/ BrE AmE ( also ˌyah-boo ˈsucks ) interjection British English
used to express dislike or disrespect for someone, or to make fun of them
Yah-boo /ˌjɑː ˈbuː/ BrE AmE ( also ˌyah-boo ˈsucks ) interjection British English
used to express dislike or disrespect for someone, or to make fun of them
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012