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1. Brother-dad
A rare occurrence wherein a son sires his own sibling of a close age.
"Hey man, you know when we were growing up and you wanted to know who your dad is? Well I fucked mom. Yeah, I'm your brother-dad."
2. Brother-Son
A person who is your child in the future, but ends up as your brother in the present day.
John and Jane had a son. They went back in time and gave the baby to John's mother. Now the baby's John's brother and his son or his brother-son.
3. dad
1. (n) Term used for addressing (typically male) friends, as in man, dude, or brother.

2. (n) Cigarette

3. (v) The act of smoking a dad
"Hey dad, you wanna go dad a dad?"

"What's the name of your band?"
"Dads Without Kids"
4. Brother from another Mother
A brother that is only related to you through your father, as in he is your half brother, there fore he is your brother but from another mother.
John and I are brothers, but since he is the son of my step-mom he is my brother from another mother
5. Wee Brother's Top
A saying to describe an item of clothing someone is wearing which is clearly too small for him. This is on the knowledge that if your are wearing something that is your wee brother's (little brother's) then it will be too small as your little brother would be often a lot smaller than you. This term is also used less commonly for something too big for you in which you would call your "Dad's top" or your "big brother's" top, again going on the knowledge that these people are probably a lot bigger. Obviously the term "top" refers only to a Tshirt but it can be used similarly when describing trousers as your "wee brother's trousers" but this phrase is not often used. To use this phrase on somebody is seen as an insult insinuating that either they cannot afford their own clothes or that they are too fat to fit into a certain garment of clothing. It usually results in laughter for those observing, as well as the victim of the joke being embarrassed and hard pressed to think of a come back.
That's rich coming from the guy wearing his Wee Brother's Top!

Fucking hell, are your Wee Brother's Trousers tight enough at the bulge

God sake man, what size is that, it looks like youe Dad's top
6. James's Dad
To do a "James's Dad" is to purchase two different items from the menu and share. This allows you to try two different things without paying over the odds...

The term came from visiting a restaurant and overhearing a family on an adjacent table. The young boy was called James. He wanted the same dessert as his brother but his Dad suggested that they all have something different and share to ensure more variety!

This we thought was a good idea, we now do a "James's Dad" everywhere we eat! Try it!
A: "I can't make up my mind whether to have the fudge cake or the apple pie?"

B: "Neither can I"

A: "Wel how about I have the fudge cake and you can have the apple pie, then we can do a James's Dad..."

B: "Nice!"
7. brad
A dad/brother=brad. A guy that your mom dates for at least 3 years (or marries) who is less than ten years older than you and acts like a father, but is young enough to be an older brother.
Me: "He was basically your step dad."
Friend: "Well kind of, but I think of him more like a brother."

Me: "He helped raise you for almost ten years."
Friend: "Yeah I guess you're right, but he was a lot like an older brother. He was like a dad and a brother at the same time. I don't know what to call him."

Other Friend: "You should call him your brad."
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