When you go to a party, get super wasted, and find a hot chick to bang. however, you don't realize the "hot chick" last night, was your sister. buts it's ok because you used a rubber.
last night Travis went to a party and found a bomb ass chick who said her name was Stephanie. I can't wait til he realizes he guenther'ed his sister. She same Stephanie that is his sister. whom he has lived with his entire life, and who's bedroom is 4 feet from his.
by delivery boyy! February 3, 2010
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a person or group of persons that experience unfortunate events due to the "force unknown".
or:

the first born offspring of the blue spotted african llama.
Dude, today has been such a GUENTHER!

or:

Your as ugly as a guenther.
by BryceBerryManne October 21, 2007
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katie allen's best friend forever. they're two hot girls who are always together. the only reason that they wouldn't be together is if they had different classes but they are so cool and awesome that without them the world would stop spinning. katie allen loves holly guenther forever and ever.
Holly guenther is not that great at sports but she has blonde hair, blue eyes, and is really tall and skinny. she is flawless and people wish that they were her because she can get any guy she wants. you would be very lucky to have a holly guenther in your life.
hey have you seen holly? ya she's with katie.
i can't find katie, oh well if you find katie im sure that they'll be together.
god holly guenther is so hot, id be so luck to be her boyfriend.
who wouldn't love holly guenther? she's perfect.
by KatieAllen loves HollyGuenther September 1, 2010
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Doing a 'Guenther' - finding any excuse to avoid hanging out with your mates. Examples include scweffing with wife/girlfriend and playing golf with father-in-law.
Is Jon coming this weekend? Nah, he's pulled a Guenther.
by Whiskycam April 1, 2017
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