A common named used to describe the mythical creature the Loch Ness Monster.
It's also know as the nickname for an extremely sweet boy. He is often seen joking around with his friends and being all arouNd happy and optimistic. He loves his family and his friends. He enjoys bowling, cars, and traveling.
Aww! Nessie is such a sweetheart!
by Lover of Snails September 8, 2010
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n. when you take a dump that is so long that it sticks out of the water.
After eating that bowl of oatmeal, I feel like I could lay a nessie.
by shane November 30, 2004
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A guy who says he has a big penis, but there is no proof that it exists.
That guy must be a nessie, he claims to have a big one, but he can't get a girl.
by kir3d May 4, 2010
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Nessi is the cutest nickname for Vanessa on this entire planet. Is actually just as awesome as a Vanessa, but a little bit kinkier and more depressed. The only thing she reads are gay fanfics with a lot of smut. She is extremely sensitive, so watch your mouth! She is the perfect combination of cute and hot af. A lot of guys want her, but she only wants that one person. Literally the most supportive friend you'll have and also the chillest roomate. If you have a Nessi in your life, show her a lot of love and affection and let her know that she is a very important human being, that lights up your world. (because that's what she is)
Friend: Yo, my crush wants to vape with me but 'm not sure.....
Nessi: DO IT OMG I SHIP IT SO HARD GO FOR IT YAAAAAAS GIRL GET THAT DICK
by coolassfriend January 7, 2019
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When a person is humpped by a dog. No penitration is neccessary.
Greg: yo my dog started to hump me yesterday when I was tring to grab something from under the table.
Ryan: you got nessied bitch
by C money $$$$ March 30, 2009
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Renesmee Carlie Cullen's nickname, given to her by Jacob Black because he considers her full name to be a mouthful, though Bella strongly dislikes him nick-naming her child "after the Loch Ness Monster". However all of the characters adopt this shortened version.

*spoiler* Also "Vanessa Wolfe" is actually Nessie. In Breaking Dawn Bella is worried about a possible Volturi attack, so she gets Fake Id's for Jacob and Nessie calling them Jacob And Vanessa Wolfe, since Bella assumed that that was a name that "Nessie" could be short for *spoiler*
Grandpa Charlie: “See you tomorrow, Nessie.”
Bella: “Not you, too! Huh? Her name is Renesmee. Like Renée and Esme, put together. No variations.”
by twifangirl21 April 27, 2009
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