1) An event involving one woman and four men engaged in sex, typically with the woman using both hands, her both, and either her vagina or anus.

2) Any form of sex done in a quad, such as an academic quad.
Keith: "Jane, where did you go? You were following us through the quad last time I saw you."

Jane: "I had a quadbone."
by Anon_E._Mouse September 7, 2006
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1) An event involving one woman and four men engaged in sex, typically with the woman using both hands, her mouth, and either her vagina or anus.

2) Any form of sex done in a quad, such as an academic quad.
Keith: "Jane, where did you go? You were following us through the quad last time I saw you."

Jane: "I had a quadbone."
by Anon_E._Mouse September 8, 2006
Get the quadbone mug.