Top Definition
This word first originated from Peckham but, has spread through to the London area. When someone is jealous of someone else, they are loncing them, thus being a loncer.
Kelly: I hate Kim, she's so pretty.

Beth: Kelly is a Loncer.

Sarah: How is she?

Beth: She's loncing Kim
by Wifey Tremorz January 29, 2009
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