Spam is a simple term for a repetitive line of words that flood the entire screen faster than obese people at buffet tables. People who create spam are genuinely complete fuckwads, who deserve to be shot in both knees and forced to consume their keyboard and monitors.
Example spam:
Mekei says: The old man came and OB OB OB OB OB OB OB OB OB OB OB OB OB
Mekei says: FUCK! STUPID TELNET!