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1.
When people are talking all around you, yet you are off in your own little world. No friends. When nobody pays attention to you. Loser. Lost.
"Guys! Guys! The guy! The guy at the pier! Guys!!! The guy at the pier! Guys the guy! The guys at the pier!!! Guys!"

"LONING!"
by Loning Expert December 02, 2011
 
2.
The present tense verb for doing something on your own, especially when friends of yours are available and you are inexplicably just trying to appear cooler than them. Also often applied to people who you want to point out are boring loners.
Guy #1: Hey, you wanna go to the party wit meh tonight??
Guy #2: Naw, man, I'm loning it
by The5thChan September 30, 2011