2 sentences

1. 这种大事你可千万不能胡来。

   zhè zhǒng dà​shì nǐ kě qiān​wàn bù néng hú​lái.

   You absolutely must not act recklessly in such an important matter.

   Source: Dong Chinese Dictionary

2. 他完全是在胡来，把原本计划好的聚会给搞砸了。

   tā wán​quán shì zài hú​lái, bǎ yuán​běn jì​huà hǎo de jù​huì gěi gǎo​zá le.

   He was acting completely recklessly and ruined the party that had been planned.

   Source: Dong Chinese Dictionary