to vomit in a way that involves the contents of the stomach coming out of the mouth with great force

A man sitting next to me on the flight suddenly projectile vomited. 坐在我旁边的一个男人在飞机上突然呕吐起来。

Sometimes a baby has just finished a bottle of milk and they projectile vomit it all back up again. 有时候小婴儿刚喝完一瓶奶，就又喷射性地呕吐出来。

the contents of someone's stomach that come out of their mouth with great force when they vomit

Being a parent can be grim when you're dealing with projectile vomit at 3 a.m. 凌晨三点还要处理呕吐物，为人父母真是件很糟糕的事情。