noun
informal <非正式>
1something large or notable of its kind, in particular
异常大的东西, 尤指：
1.1Austral. a large male kangaroo
〈澳〉大雄袋鼠。
2chiefly N. Amer. short for
baby boomer (see
BABY BOOM).
词源
early 19th cent.: probably from the verb boom BOOM1 + -ER1.