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1.
Term used in oil and gas for describing a well where information is to be kept secret. Only people in the know are to hear or see information. Can also be used in everyday speech as something to keep secret between a group of people.
Remember what I told you about Julie? Keep that tight holed.
by Big Head Mike July 07, 2009
 
2.
a tight cunt hole that u cant penertrate
michales mum was so tight i couldent get it up her
by luke May 19, 2003