Top Definition
Refers to the act in which the male reproductive organ enters the female reproductive tract as a result of copulation.
John: My cousin Theresa got stabbed by a blunt instrument.
Rose: Ha? What are ya on about?
John: Aye, she's got a bun in the oven.
Rose: Oh right. The stupid bitch!
John: Aye..
by sublamagee February 01, 2011

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