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A co-worker who laughs out loud (LOL) at instant messages they receive. This action can be especially disrupting and more often absolutely annoying to other co-workers who are silently furious and disgusted at the serial laugher's complete lack of awareness of their surroundings.
I swear, all that Loller next to me does is giggle with the office girls over IM.
Loller by Major Spooge July 25, 2008
A 'lol' (laugh out loud) with an added "ler" at the end.

As with "lolz" and "lolz0rz", "loller" is just another form of lol.
loller by CC June 23, 2003
A charlatanistic harlot.
Guy: "You slept with him, didn't you?"
Girl: "No, I didn-"
Guy: "Loller!"
Girl: "lollerskates"
loller by Dean March 27, 2005
A person who don't listen to you or don't pay attention when you're talking to him/her. This kind of person will simply answer with few words and will have a lot of 'lol, LOL' into his answers. They will also reply with just 'lol, LOL' in a conversation.
John : Hey, how are you? xD
Bob : Good lol
John : So wassup?
Bob : nm, lol..
John : man u say too much 'lol'
Bob : u think? LOL xD
John : ...u're just a loller
Bob : lol..
Loller by Oknix June 29, 2011
This is a person who cannot come up with anything original or deviate from the use of the word "lol". so much so, that he/she begins and ends texts with "lol"
Guy 1"Lol that was the funniest thing i'd seen in a while we gotta do that again lol."
Guy 2 " You just can't stop lolling you loller, can you? Use rofl or SOMETHING else."
Loller by Martialdemon November 4, 2010
The correct noun form of the phrase lol. Often used when someone wishes to call attention to something that is worthy of being laughed out loud at.
Person: Let me get a loller on that broken elevator.

Surrounding passers-by: Lollers!
loller by Rafdaddy December 20, 2007