A spammer is someone who sends a lot of unwanted messages, especially by email or on the internet.
Spammers are not liked because they bother people with too many messages.
Examples:
The spammer sent me so many emails.
I don't like spammers who send too many messages.
The spammer is always bothering people with his messages.
The spammer sent a million emails in one day!
The spammer is like a robot that never stops sending messages.
The spammer is the reason my inbox is always full of junk.