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When you do a Nathan, you're trying to stop someone from talking to or getting with a girl, acting as if you're their boyfriend, when really you aren't.
You - I'm talking to Emily at the moment, you know.

Dude - Could you not, I like her - I'm speaking to her, leave her alone.

You - Dude, don't be Nathan.


You - Would you mind if I got with Emily, dude?

Dude - Yeah sure, I wouldn't do a Nathan, Emily isn't mine so she's free for you to get with
by EhhhaaaNjjjjjjjTaaaan March 03, 2014
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