指手画脚 gesture wildly
Explanation
指说话时做出各种动作。形容说话时放肆或得意忘形，也指瞎指挥。
Refers to making various movements while speaking. Describes a presumptuous or self-satisfied way of speaking; also refers to directing blindly.
Origin Story
贾府一年一度的元宵家宴热闹非凡，贾母高坐上首，阖府上下欢声笑语。贾政因公务在身暂时离席，宝玉见此情景，便跑到贾母身边，指着眼前的精致糕点，绘声绘色地向贾母描述着糕点的制作过程，又指点着其他宾客，评价着他们的衣着打扮和举止言谈，俨然一副主人的姿态。贾母起初还觉得有趣，但听着宝玉喋喋不休的评价，脸上逐渐露出了不耐烦的神情，一旁的王熙凤更是忍俊不禁地掩嘴轻笑。宝玉兴之所至，甚至还指点起那些乐师来，指挥他们如何演奏，弄得乐师们手足无措，曲调也变得凌乱不堪。最终，还是王熙凤出来打圆场，这场家宴才得以继续进行下去。
The annual Lantern Festival banquet at the Jia Mansion was lively. Grandmother Jia sat at the head, and the whole family was filled with laughter. Mr. Jia had to leave temporarily because of his official duties. Seeing this scene, Bao Yu ran to Grandmother Jia, pointed at the exquisite pastries in front of her, and vividly described the production process of the pastries. Then he pointed at other guests, commenting on their clothes, appearance, and manners, acting like the master of the house. Initially, Grandmother Jia found this amusing, but as she listened to Bao Yu's incessant comments, her face gradually showed impatience. Wang Xifeng beside her could barely suppress her laughter. Bao Yu even went so far as to direct the musicians, instructing them on how to play, leaving the musicians at a loss and the melody disorganized. Finally, Wang Xifeng had to smooth things over, so the banquet could continue.
Usage
形容说话或指挥时，动作多，不稳重，也指瞎指挥。
Describes speaking or directing with many gestures and thoughtless movements; also refers to directing blindly.
Examples
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他总是指手画脚地指挥别人工作，让人很不舒服。
tā zǒngshì zhǐ shǒu huà jiǎo de zhǐhuī biérén gōngzuò, ràng rén hěn bù shūfu。
He always directs others' work with gestures, making people uncomfortable.
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会议上，他指手画脚地解释着方案，显得有些夸夸其谈。
huìyì shàng, tā zhǐ shǒu huà jiǎo de jiěshì zhe fāng'àn, xiǎn de yǒuxiē kuākuā qítán。
At the meeting, he explained the plan with gestures, appearing somewhat boastful.
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他喜欢在别人做饭时指手画脚，弄得大家都很烦躁。
tā xǐhuan zài biérén zuòfàn shí zhǐ shǒu huà jiǎo, nòng de dàjiā dōu hěn fánzào。
He likes to gesture when others are cooking, making everyone very irritable.