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A unihole is when someone has so much double pentration that there is no longer two distinguishable holes, instead there is one gaping hole remaining. This serves a useful purpose as you can hide things in it.
"my unihole is hella sore from hiding my bowling ball in it" or...

"could you please remove your penis before i end up with a unihole"
by dr.babe April 27, 2006
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