A product or item that is endlessly upgraded or improved and which users don't mind having to pay full price for the latest examples. A frequent occurance within video games.
EA Games have two cashcows - "The Sims" and the "FIFA" series of games. Neither of which I'd play if you paid me.
by Mr Ben February 08, 2005
(n.) A well-selling product into which no investment is put asides meagre marketing and production costs, yet price rises rise disproportionatley to costs, and well above inflation, milking the cow for all it's worth.
Oil prices are the biggest of all cash cows.
by Kung-Fu Jesus May 12, 2004