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1.
c2c
Cam-to-cam. Online interaction where both parties are visible to each other via webcam. Sometimes used for simple conversations, but most often for exhibitionistic/voyeuristic remote sex. Usually seen in terms of a proposition in a chat room.
My webcam is on, any horny ladies want to join me for c2c?
by Evac156 February 18, 2005
 
2.
c2c
cock to cock used in gay chat rooms for guys with camera who want to chow their cocks to each other on web cams
hey long^john wanna c2c?
by Long Don Silver June 09, 2004
 
3.
c2c
Consumer to Consumer. As in, the two parties involved in financial or business transactions, traditionally sales of goods or services.

contrast to: b2b, b2c
The Microsoft corporation does business in both b2b and b2c markets. Sun Micrososytems and Oracle (both floundering next to Microsoft) are primarily b2b focussed. While Ebay's business is mostly b2c (between Ebay the company and their users), the business they enable with their service is almost all c2c, between one user and another.
by EAHIV June 10, 2004
 
4.
c2c
Consumer to Consumer. See also, b2b and b2c.
c2c means conducting business between consumers instead of with a business.

Yard sales and eBay auctions are examples of c2c.
by Downstrike June 07, 2004