johnny
/ˈdʒɒnɪ/noun
(pl. -ies) Brit. informal <英, 非正式>
1
- used as a name for an unknown man, often suggesting that he is unimportant or insignificant（用以对不知名男人的称呼）男子, 家伙（常暗示此人无足轻重）：
the security johnny insists that you sign the visitors' book.
那个保安坚持要你在来访登记簿上签名。
2
- a condom避孕套。
3
- US a gown fastened at the back, worn by hospital patients〈美〉（医院病人穿的）后开罩衫。
词源
late 17th cent. (in sense 1)： pet form of the given name John; sense 2 dates from the 1960s.