dicaprio

瞎逼逼=瞎BB [xiā bī bī] v. To talk sheer nonsense; to ramble on; to nag; to gossip; to judge others.

你行你上,不行别瞎BB [nǐ xíng nǐ shàng, bù xíng bié xiā bī bī]  If you can do it then you should go up and do it, otherwise you’d better keep your mouth shut.