A synonym for "being or turning bisexual" or "getting curious towards one's other sexual side". That term is derogatory and describes bisexuality from the unilateral point of view of an exclusive homosexual and/or heterosexual stand.
Karla is not completely a lesbian. She is rather... mixed up.

Maybe she is bisexual?

Possibly. But we still love each other dearly.

I have no doubt about that
by Ysengrim January 02, 2004
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When your girlfriend does a stinky fart whilst entertaining her pussy and it instantly ends the fun.
Gary is eating Debra’s pussy and Debra does a Stinky fart and instantly ends the fun. The Mix Up
bloody hell Debbie that’s disgusting”
by D&G17 November 03, 2018
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when one is to ask or repely to a question with a random answer
(person 1)Hey how's the weather? (person 2)Family guy comes on at eight.(person1)Why are so "mix-up"
by jumper1847 September 18, 2010
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your underside junk, commonly referred to by old greg as a mangina

occasionally is illuminated
"what about the boat times?"
"those weren't really times that was more of an exposure"
"you saw my downstairs mix-up"
by 0ld greg January 10, 2009
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It is when a person purposely gets his friend and that friend's sister both dead drunk and then tricks them into having sex with each other.
Kevin pulled the Mangione Mix-up on Mike and his sister, and everyone got a good laugh.
by Pimp Master K March 28, 2003
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When you accidentally fuck the dog and beat the wife, instead of the other way around
"Good morning Ted! What's wrong?"
"I accidentally had a classic mix up this morning"
by 093728993 June 13, 2016
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