Top Definition
the condition that occurs when a male enters frigid water and his member thusly contracts to the size of a belly button, either outie or innie (depending on wellness of his endowment), and causes the temporary formation of an apparent "second belly button" for the duration of his time in the water and a period of approximately five minutes after his recession to dry land.
"Yo bro I totes had Second Belly Button Syndrome when I had to bail on that sick whitewater run last winter. It was hella gnarly, yet def not tubular. Ok well maybe inwardly tubular a wee bit bro."

"That's sick nasty man. Don't fucking tell me that...."
by Dr. McNadsty October 19, 2010
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