Someone's butt is their bottom.

The butt or the butt end of a weapon or tool is the thick end of its handle.

The butt of a cigarette or cigar is the small part of it that is left when someone has finished smoking it.

A butt is a large barrel used for collecting or storing liquid.

If someone or something is the butt of jokes or criticism, people often make fun of them or criticize them.

If a person or animal butts you, they hit you with the top of their head.