Ladette is a young woman whose social behaviour is similar to that of male adolescents or young men. Ladette behaves in a confident and noisy way, who drinks alcohol and may enjoy sport or other activities that are traditionally enjoyed by men.
“假小子”指的是社會行為類似于青少年男性或者年輕男性的年輕女性。“假小子”表現很自信，但也很吵鬧，愛喝酒，可能喜歡體育或其他男性通常喜歡的運動。

Analysts believe the ladette phenomenon has been driven by increasing levels of financial independence among young women.
分析人士認為，“假小子”現象是因為年輕女性經濟越來越獨立。

For example:
例句：

17-year-old Zola and her gang of ladettes boast about just how much under-age drinking they did last weekend.
17歲的左拉和她的假小子同伴們自夸說上周末喝了好多酒，而她們還沒有達到法定飲酒年齡。

She has also had a reputation as a hard-drinking, hard-partying ladette who seems to enjoy the single life.
她酗酒，愛開派對，是個假小子，并因此名聲在外，看起來很享受單身生活。

（中國日報網英語點津 yaning）