To spoof something means to imitate it in a funny or deceptive way, especially in order to trick someone.
Spoofing can be funny, but it can also be mean if it tricks someone.
Examples:
He spoofed his friend's voice on the phone.
The email address was spoofed to look like it was from the boss.
She spoofed the famous singer's dance moves.
The cat spoofed the dog's bark and it was very funny.
The alien spoofed a human and everyone thought it was a real person!
The robot spoofed the teacher and everyone laughed.