What does "blow" cow X mean? Why do you say "blow"

"boasting" is a common saying among Chinese people. In the present sense, it means "boasting". So, where did this proverb and its usage come from?

According to expert research, the word "bragging" originated in the upper reaches of the Yellow River in China. When the Yellow River flows through Qinghai, Gansu, Ningxia, Shaanxi and other provinces (regions), the current is fast, the beach is dangerous and the waves are bad, so it is difficult to sail. In ancient times, when bridge traffic was underdeveloped, people living along the upper reaches of the Yellow River came up with a way to solve the problem of crossing the river: to replace the boat with a raft. Before 195s, in the upper reaches of the Yellow River, where the railway was not yet opened and the road traffic was inconvenient, kayak was always an important means of transportation for people living in this area.

The method of the raft is as follows: when slaughtering, first try to peel off the whole fur of sheep or cattle, then depilate the whole fur with salt water, then coat its limbs and neck with vegetable oil, soak it in water and expose it to the sun to make it soft, then sew it into a bag with a string, leaving only a small hole, and then seal the small hole tightly after blowing enough air, and then tie several leather bags together with wooden boards to make the raft. In ancient times, people didn't have pumps and air pumps, so there was only one way to inflate rafts-blowing them with their mouths. Sheepskin bags are small in size and can be blown directly with your mouth. But even sheepskin bags can only be blown up by people with very strong physique and large lung capacity. The cowhide bag is too big to be blown directly with your mouth. Therefore, in the upper reaches of the Yellow River, if someone says that he can blow up cowhide bags, it will be considered as bragging; When residents there are impatient with other people's boasting, they often say to them, "If you have the ability, go to the Yellow River to brag!" Over time, "boasting" has gradually become synonymous with "boasting and boasting" and has gradually spread.

brag: it comes from the butcher. Once upon a time (and now), after killing pigs and sheep, the butcher would cut a small mouth on the leg of pigs and sheep near the hoof, put an iron bar in it and poke it, then put his mouth together and blow hard into it until the whole body of pigs and sheep swelled. In this way, it will be very convenient when peeling, and the skin will crack by itself with a gentle pull with a knife. This is called blowing pigs or blowing sheep. If you deal with cattle in this way, it's called bragging.

However, butchers rarely use this method when slaughtering cattle, because the cattle are huge, with tough skin and little subcutaneous fat. To inflate the whole cow, it is necessary to have extremely strong diaphragm and huge lung capacity, which is very human. Anyone who says he can brag is 99.9999 percent "bragging"!

"bragging" is also called "bragging", but people who don't know its origin, in order to further strengthen its derogatory meaning, call it "bragging B" or "cow B" slightly; Because this last word is often replaced by "x" in writing, now some people call "bragging" "awesome".