A large, cavernous and gaping anus following vigorous and prolonged anal intercourse with large objects and/or fists. The term is sometimes erroneously used in conjunction with a large or slack vagina (see Wizard's sleeve).
'Wow Dave, that was one hell of a fisting session. However I do appear to have lost my watch in your muscle bucket!'
by Axletramp September 24, 2009
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Muscle bucket
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