A woman who will sleep with your best friend then ride off with him out of the country.

See slut.
Launcelot- Wan't to leave your husband and ride off to France?

Guinevere- Sure!
by God981 January 19, 2010
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A person who will stand up for you,and keep your secrets. She will also be one of the most trustworthy people.
Guinevere;A person who will stand up for you,and keep your secrets. She will also be one of the most trustworthy people. She is also a character from Camelot who ran away with Lancelot.
by Queen Guinevere February 8, 2019
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A girl who, while she is a lovely person, is constantly cockblocking people, typically without realizing it. (Can simply be referred to as "Gwen." Male cockblockers are referred to as "Agravaine" or "Uther.")
Merlin Fan #1: I swear Merlin and Arthur were about to kiss in that last scene, but then Gwen walked in and ruined the moment.
Merlin Fan #2: Dammit Guinevere, you're such a cockblocker!
by Mehhrlin December 7, 2011
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A groupie, except for members of a fraternal order.
Pam: Those Shriners look so sexy in their fezzes!
Barb: Pam, you're such a Guinevere!

At the parade's end, all the Kiwanis were met by their families and Guineveres.
by Shevek0506 April 5, 2009
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guinevere cashew is allergic to nuts and loves herself.
"oh my god I didn't know that guinevere cashew goes to my school"
by abbio420 April 24, 2020
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Having plain missionary sex with a wood chipper while screaming gay slurs at the top of your lungs. Whilst juggling big black dildos.
1:Man my junk is destroyed.

2:why
1: I did a dirty Guinevere
by ThatTiredKid April 3, 2023
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