Someone who hugs, touches or stays on one subject of a conversation umcomfortably long. Usually unaware they are doing so.
"Man, Josh hugged me forever, he was such a long-on!"

"Ew, a guy at McDonalds was a long-on, he held his hand around mine when I got my drink for maybe ten seconds."

"Amy talked about shoes forever, I didn't know she was a long-on!"
by Katesies_Pirate July 23, 2007
Top Definition
Someone who is stupid and retarded in ways that con not be imagined by mankind.
did you see that longon walk by?
by Albert Leskoviku June 07, 2005
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