Top Definition
Used in reference to a positive, often exceptional sexual experiencing involving two or more persons.
"I bet you and those twins had one huge bonefest last night!"

"Man, I'd like to take her to an all-night bonefest."
by Al-Mac May 23, 2008

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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