What is pea brain? As you can see from the words. 'Pea',peanuts, a very small size of nut. Imagine you have a brain with a pea size. Can you guess the meaning? Some people used to insult their friends : "hey you, you pea brain". Do they think of themselves that whoever says people is the one has a pea brain. Think before you speak you "pea-brainers".
Last but not least, i think i have one
How about you guys out there?