Yell is a verb meaning to shout loudly, especially because you are angry, excited, frightened or in pain.
It can also be used as a noun referring to a loud shout, often expressing strong emotion.
In informal contexts, yell may mean:
1. To complain loudly ("Don't yell at me!")
2. To cheer enthusiastically ("The fans were yelling for their team")
3. In internet slang, to express strong emphasis ("I'm so excited I could yell!")