When one twin is clearly more attractive, cool, or likable than the other twin. After suffering through a lifetime of people asking where the "hotter" or "funnier" twin is, the less desirable twin inevitably forms a "chip" on his or her shoulder, thus making the chip twin even less enjoyable to be around.
1.
Party host: "Where is Andy? I love that guy. He's hilarious."
Chip twin: "Why is everyone always asking me where Andy is? How should I know? I don't know where he is all the time! I'm just as funny as he is!"
Party host: "Listen chip twin, you're not invited unless you are with Andy. Robin didn't go around trying to fight crime on his own."
2.
Guy at bar: "So how do you two know each other?"
Chip twin: "We're twins."
Guy: "No, seriously. How do you know each other?"
Chip twin: "We are twins."
Guy: "Come on. Seriously, how do you know each other?"
Chip twin: "You're an asshole."
*Twins walk away*
Guy: "What did I say?"
*Guy 2 walks up*
Guy 2: "Fucking chip twins, man."
Party host: "Where is Andy? I love that guy. He's hilarious."
Chip twin: "Why is everyone always asking me where Andy is? How should I know? I don't know where he is all the time! I'm just as funny as he is!"
Party host: "Listen chip twin, you're not invited unless you are with Andy. Robin didn't go around trying to fight crime on his own."
2.
Guy at bar: "So how do you two know each other?"
Chip twin: "We're twins."
Guy: "No, seriously. How do you know each other?"
Chip twin: "We are twins."
Guy: "Come on. Seriously, how do you know each other?"
Chip twin: "You're an asshole."
*Twins walk away*
Guy: "What did I say?"
*Guy 2 walks up*
Guy 2: "Fucking chip twins, man."
by ChetWhitlock September 25, 2014

Muffin twin is the best person you can imagine. Not everyone can have a muffin twin in their life, but if you have a chance, then you should grab it ASAP. Don't let muffin twin go - it's a win for you and that person will be your best friend for lifetime.
Muffin twins are also gorgeous, they connect with you on a deeper level and their sense of humor is just the best.
It's hard to find a muffin twin, but it's worth searching.
Muffin twins are also gorgeous, they connect with you on a deeper level and their sense of humor is just the best.
It's hard to find a muffin twin, but it's worth searching.
Person 1: Who is that fabulous person?
Person 2: Oh, this is my muffin twin!
Person 1: I wish I had one - it's so perfect!
Person 2: I know, but it's just mine.
Person 2: Oh, this is my muffin twin!
Person 1: I wish I had one - it's so perfect!
Person 2: I know, but it's just mine.
by Muffin twin January 1, 2019

by SauceMilliken December 8, 2021

The Twin Swapping is when your wife is out of town and her twin comes over so you fuck him in the ass.
My wife lily went out of town for business and her twin luke came over and asked about twin swapping so I fucked him in the ass
by 417wsm February 16, 2023

a profile twin is like a type of social media user who has the same profile picture as you (if the pic on your profile isn't u but a photo from google and another person has the same one on theirs)
me and my friend have the same kermit the frog meme profile picture on twitter so we're profile twins
by Emilia Fernandez July 30, 2019

To get beat in a video football game (Madden or NCAA) by 21. The person losing by 21 gets a courtesy drive once the other player hits 21. This helps to move games along.
by Biggunz240 December 18, 2010

Siblings born on the same day, but one (or sometimes two) years apart.
Possibly a play on the idea of "Irish Twins"
Possibly a play on the idea of "Irish Twins"
by Ollie794 December 11, 2016
