What is Msn-loner?
1.
Someone who either doesn't have many contacts on 
To attract attention they will sign out for a couple of seconds then sign back in again, trying to draw attention to themselves so that people will talk to them.
Person 1: OMG that Jonathan has signed in so many times this past hour after being offline for like a second!
Person 2: He's an MSN-loner, he's just trying to get attention.
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1. 
A 5.56mm assault rifle currently in the developmental stages to replace the M4 Carbine and M16-series weapons, and serve along side the ..