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1. No big deal
Used to sarcastically act like you aren't trying to brag about something that isn't worth bragging about. Should make it seem like you are bragging about it. Usually said in a sarcastic tone. Not to be used when something actually is a big deal.
Starbucks lady: "Total is $4.23"
Me as I hand her $4.23: "Exact change, no big deal"

or

Girlfriend walks in, me on the computer
Me: "Just checking the spiderman forums, no big deal."
2. no big deal
1. not a problem

2. a person or thing that does not give one a reason to worry
Don't mind the window, it's no big deal.
3. No Big Deal
Key phrase of the one and only Samantha Fett
You have an excuse for everything" "No Big Deal
4. no big deal
something said after something amazing has been accomplished, usual said in a sarcastic to make ones self seem modest when in reality one is bragging. usually followed by "'cept it is"
i just got a 100 on my test! no big deal, 'cept it is
5. No big deal
It's not a big deal.
No big deal but I'm pretty much a big deal.
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