Refers to the circulation of a rumor regarding the size of a dude's dick.

The gapevine would be a series of people who have slept with a guy and subsequently talked about the size of his weiner to all their friends, who would then also attempt to or succeed in sleeping with that dude, primarily so they can confirm said rumors regarding weiner size.

See gaping for more info.
"Chad is ugly, and an asshole. How does he get laid so much?"
"He has a big dick."
"How would you know?"
"I heard it through the gapevine."
by sue de nimh April 10, 2016
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