A girl who, just as the man is about to pull out, sticks her body to him in order to stop him pulling out.
"I was about to pull out, but she went barnacle. Now I have child support payments."
by Norm Norman September 03, 2009

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Top Definition
The Spongebob Squarepants fanatic's way of say "shit", as in you messed up, or "damn it".
Patrick, "I lost the tickets Spongebob."

Spongebob, "Oh barnacles"
by PH34R3ST June 07, 2005

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1. A small marine organism with a shell that clings to rocks and ships.
2. A clinging or dependent person or thing
3. A large zit or scab
4. An exclimation used by Sponge Bob Square Pants meaning "shit" or "fuck"
1. Based on the number of barnacles stuck to this sunken ship, I deduce that it must have been here for a while.
2. God, I hate Henry! The little barnacle won't leave me alone!
3. Did you see the barnacle on Lisa's face?! It was huge!
4. Patrick: "I'm not actually gay, Sponge Bob."
Sponge Bob: "Oh barnacles!!"
by D-Vo January 21, 2006

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A person who attaches themselves to any living being surrounding them as a form of comfort. Cuddling, spooning and snuggling are also correct terms. A barnacle latches on to anyone in sight and does not let go.
Cheyenne: Oh hey kirsten! How are you?
*Kirsten latches on to cheyenne*
Kirsten: Now im better!
Cheyenne: Oh kirsten! You barnacle, you!
by astoldbyginger February 29, 2008

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A slut or a person who has multiple sexual partners. Biologically speaking, a barnacle can mate with multiple partners at the same time through the use of tentacles.
Mary - "Lucy just got with 5 boys at once. She's such a barnacle."
by lols_royce January 31, 2010

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Any clingy drunk at the bar who insures your misery by talking your ear off about the most inane shit you can imagine. Excuse yourself to the bathroom and leave them talking to your friends.
"Oh, shit. Here comes Kelly. Can't wait to listen to that barnacle talk about used Telecasters for 6 hours. Pardon me, I have to go to the bathroom."
by Turbo Thunderdome October 13, 2008

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A person who attaches to you and is extremely clingy.
Uh oh, here comes the barnacle.
by blackgirl68 March 10, 2015

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A person who desperately looks to latch themselves onto a pre-existing group that does not wish to expand the group.
Dude, that guy is a total barnacle! We gotta ditch him fast.
by Marc Logan July 05, 2012

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