bum

The buttocks.

Okay, everyone sit on your bum and try and touch your toes.

For quotations using this term, see Citations:bum.

The anus.

John said that when he was little he stuck his finger in his bum and tasted his poopies and it was good.

What could the man possibly be hiding up his bum anyway?

An act of anal sex.

Go for a bum

To sodomize; to engage in anal sex.

Your bars are fake and my bars are real; / Is it true you got bummed on a field?

An expression of annoyance.

(more vulgar)

Maxine tried hers. ‘Oh bum,’ she said crossly. ‘The sugar isn’t sugar. It’s salt.’