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A sexual position, where 2 girls do the postion 69, and two guys are penetrating on either side (1 - 69 - 1)
"It's not gay if it's 1691 with two chicks"
1691 by oopsitsaboris February 26, 2015
An event of unknown but mythical status, the exact knowledge of what occured only known to a select few however speculated about endlessly by those not in the know.
"Man, that was an awesome party last night"
"I know, did you hear about the president's 1601?"
"Yeah, man what really happened with him?"
"No idea, bet we'll never know."
1601 by MCLI April 25, 2008

Perpetual Anal Motion Postulate Therum Vol.1 Revised Addition Platinum Anal Series Copyright 1901 

This natural phenomenon has been around since the dwarven days of old. When two men desired anal they would conjoin there anus's and one partner begins by defecating. Once the fecel matter has penetrated the parallel anus the sphincter reacts and takes in the feces and mothers it as if it were its own. Once the anus has acquired its new bounty it relieves its self back from whence it came. Once statrted, the petpetual anal motion can not be stopped or disturbed by any means or this very act would be defying god himself and all life would end.
The Perpetual Anal Motion Postulate Therum Vol.1 Revised Addition Platinum Anal Series Copyright 1901 can perpetuate in my cavity any day.
We killed the taigs
I would love to buy a chucky'or latte for $1690 But they were closed for Reformation
1690 by A prody boy May 13, 2021
A four digit number that lies in between 1000-2000. Nothing else.
"never seen 1691 used in the way urbdic defines it. Is it a fake definition or am I too innocent?"
1691 by MyPseudonymThatsNotMyName September 2, 2022
used to describe a woman who looks pretty hot from the back, but when she turns and you see her face, she turns out to be a haggard old woman, NOT the fine specimen of the female form you initially took her to be.
"Hey buddy, check her out!! Phwooaarr!!"

*woman turns*

"Jeez, no way mate, she's a total 1690!"
1690 by Bryan Angus December 27, 2007