A person who switches between being straight, gay and bi-sexual based on their mood and current emotions.
Julie- "Wow, he's really cute."
Anne- "Oh yeah, he is."
~fifteen minutes later~
Julie- "Omigosh. Check out that chick over there!"
Anne- "Wait... I thought you were straight. You're bi?"
Julie- "Nope. I'm just trisexual."
by slayson October 03, 2010

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one who cannot sexually choose between males, females, and themselves
Andrew: Damn, Sarah is looking fine today...so is Jim... so is my hand.
Bill: Dude, you're sol trisexual
by dooblet February 16, 2011

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A person who is interested in having sex not only with an opposite sex but also with same or anything. Trisexual is basically a person who will do anything to get pleasure, be it have sex with a girl, or have sex with a rubber doll. 95% of the time when a trisexual has sex with same gender, he does not have any kind of romantic feelings for him, just purely sexual desire for pleasure and nothing more.
Guy 1: He loves his girlfriend, but he wanted more then just pussy, so he tried having sex with a shemale to get pleasure from the anus g-spot.

Guy 2: So what does that make him?
Guy 1: Trisexual
by PsychoDevil March 23, 2010

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a person who has sexual feelings towards men women and dogs. they enjoy saying how much they want a dog. they often deny this. often theis people own a dog.
colin- "i so want that dog"
john- "where do u want that dog? in the ass"
colin- "no im straight"
john- "then why do u shag your dog?"
colin- "i cant help it i need help"
john- "yes..yes u do"

bob- "what wrong with that guy"
john- "oh hes just trisexual"
by the maths crew :D March 07, 2010

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People who are sexually attracted to tricycles
Person 1: He ended up spending the night with a tricycle
Person 2: Oh my god! I never knew that he was a trisexual!
by Megacherv October 25, 2009

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sort of like bisexual, except it is when one likes males, females, its or shemales.
bob: "dude i sucked my girlfriends dick last night"
jack: "WHAT THE FU..."
bob: "-WHAT!? im trisexual
jack: "well i guess that explains the chick, dude, and it u slept with last week."
bob: "yup."
by Mr. Jack Off July 06, 2009

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Some one who is attracted to men, women, and those in the LGBT community.
"Why is Andrew dating that lesbian?"
"Because there both trisexual"
by Alica loves to define September 22, 2014

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