When your "brown eye" (also known as an anus hole) contracts, which causes a closing effct. Once the anus hole opens once more its ends the completion of the "buttwink".

Buttwinks often occur when pinching off a turd while taking a dump or during sexual intercourse (when climaxing for both sexes).
I had to buttwink to pinch off that turd

Dude!, I was having sex with this hot chick last night and she buttwinked when she orgasmed, thats when I decided to try anal.
by Blackrose86 January 19, 2011
The little glimpse of a girls butt crack when she is wearing very low rise jeans. This is only the case when she is not wearing panties. Wearing panties makes it a panty wink.
She leaned over the counter and gave me a butt wink.
by Naterz October 05, 2005
When a chick squeezes her arse hole and it winks at you
Like a normal wink but with a chicks anus hence butt wink
by Langdonis January 24, 2009
A single shake of the hips and butt, directed towards a possible mate. Indicates interest and potential for ass play. Can also be used as a coy flirtation.
I knew Tiffanie was interested when she gave me a butt wink on the way to the kitchen.
by Team Lunch nap November 02, 2013
The feeling that occurs immediatly following an extra large shit, when your butthole contracts as a result of the 2x4 that was just pushed through your 0-ring.
Man, you should have seen that turd. My butthole is still winking ;0
by Long-log-man December 21, 2004
some crappy word from balderdash, for which i cannot remember the correct definition.
define buttwink, please.
by andrea December 19, 2004

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