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the act of falling into a manhole is when your having random sex doggy style and when you look down there is a gigantic black gaping void where not even light can escape.
becker guide to measuring manholes:

1. pencil tip
2. pinkey sized
3. D battery
4. you blow into it and i whistles
5. fist
6. head
7. can be used as a sleeping bag

dont go falling into a manhole now!
by killjoy420haha May 09, 2011
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