Definition of "bum"

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

2013, Steven L. Ablon, Daniel P. Brown, Edward J. Khantzian, Human Feelings: Explorations in Affect Development and Meaning, page 132

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

2015, Jonathan Nicholas, Who'd be a copper?: Thirty years a frontline British cop

Do you have intercourse (i.e., Do you penetrate your partner in the vagina or anus [bum]? Or does your partner penetrate your vagina or anus [bum])?

2016, Lisa Keenan-Lindsay, Cheryl Sams, Constance L. O'Connor, Maternal Child Nursing Care in Canada, page 118

[…] and said Daddy had put a finger up her bum.

2017, Jean Renvoize, Innocence Destroyed: A Study of Child Sexual Abuse

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

2016 December 3, “Soph Aspin Send”, performed by Millie B

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

2010, Jill Mansell, Sheer Mischief‎

You're a bum / You're a punk / You're an old slut on junk / Lying there almost dead on a drip in that bed

1987, “Fairytale of New York”, performed by The Pogues

Man who do you just think you are? / A silly bum with seven stars

1988, Michael Weikath (lyrics and music), “Keeper of the Seven Keys”, in Keeper of the Seven Keys: Part II, performed by Helloween

Seabiscuit, wrote another reporter, “was a hero in California and a pretty fair sort of horse in the midwest. In the east, however, he was just a ‘bumʼ”

2001, Laura Hillenbrand, Seabiscuit: An American Legend

English men bum there [Stirling] as thick as bees.

1722, William Hamilton, The Wallace

About her Chariot, and behind, / Were Sergeants, Bums of every kind, / Tip-staffs, and all those Officers, / That squeeze a Living out of Tears.

1705, Bernard Mandeville, The Fable of the Bees