丢三拉四 Forgetful and careless
Explanation
形容做事马虎粗心，不是丢了这个，就是忘了那个。
describes someone who is careless and forgetful, losing or forgetting things.
Origin Story
小明是个丢三拉四的孩子。有一天，妈妈让他去买酱油和醋。小明兴冲冲地出门了，路上看到一只可爱的小猫，便停下来逗猫玩。玩得高兴，他竟然忘记了买酱油和醋的事，直到回家才想起，妈妈已经等急了。妈妈笑着说：“下次可不能再丢三拉四了！”小明点点头，表示下次一定会认真完成任务。从那以后，小明努力改掉丢三拉四的坏习惯，认真对待每一件事。
Little Tom was a very forgetful child. One day, his mother asked him to buy soy sauce and vinegar. Tom happily went out, but on the way, he saw a cute kitten and stopped to play with it. He was so engrossed in playing that he forgot to buy soy sauce and vinegar, and only remembered when he got home. His mother was already very impatient. She said with a smile: "Next time, you can't be so forgetful!" Tom nodded in agreement and promised that next time he would carefully complete the task. From then on, Tom made efforts to correct his forgetful habits and treat every task seriously.
Usage
作谓语、宾语、定语；指粗心。
as predicate, object, attributive; describes carelessness.
Examples
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他做事总是丢三拉四，经常忘记重要的事情。
tā zuòshì zǒngshì diū sān lā sì, jīngcháng wàngjì zhòngyào de shìqíng。
He always forgets important things because he's so careless.
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因为他的丢三拉四，导致项目延期了。
yīnwèi tā de diū sān lā sì, dǎozhì xiàngmù yánqí le。
Because of his carelessness, the project was delayed.
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不要再丢三拉四了，认真点！
bùyào zài diū sān lā sì le, rènzhēn diǎn！
Don't be so careless anymore, be serious!