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1.
In poker, four cards in a row that need either one higher or lower to complete a straight. (_,6,7,8,9,_)

Opposite of gut-shot (four out of five cards in a row that are missing the center number).

Open-ended straight draws have better odds because there are eight cards that can make your straight. Gut-shots are less likely to suceed because there are only four cards that can help you.
I was chip leader and open-ended. I didn't want the guy to double up, but he was like all-in with the blind, so I called it and caught the 5 on the river. Busted his pocket rockets.
by Coell November 10, 2005
 
2.
A word used to describe a text message, IM, etc. that is not ended with punctuation or a smilie face, thus leaving the recipient wondering if they've done something wrong.
Bob: HAHAHA THAT'S WHAT SHE SAID!!!
Joe: ha
Bob: Are you okay? You know it's impossible to tell when you leave the message openended like that...

Kandi: OH BRAD, I'M SO IN LOVE WITH YOU, OMG YOU'RE CUTER THAN JUSTIN BIEBER <3 <3 <3 <3 <3 <3 <3 <3
Brad: thanks
Kandi: We're breaking up.
by Triangular Giraffe June 04, 2011
 
3.
A person who takes a dick, dildo or butt plug up the ass.
Hey baby! Let's have some open-ended action tonight!!
by LasVegasLover November 16, 2004