1) literally the act of deep penetration through any orfice, that is deep enough to contact a sphincter of any kind.

2)A meaning of severe mis-fourtune or bad luck, extremely worse than just being screwed, or fucked, or fucked dry.

A)Holly shit man, did you see that girl get sphincter fucked, i can't believe she took all 14 inches of that!

B)Damn IRS, they really sphincter fucked me this year!
by IrishEyez October 13, 2005

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