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1.
Refraining from having sex but still using play toy(s) in the form of the male organ for pleasure.
Friend: "Are you having him tonight?"
You: "No. I'll have a diet cock instead."
by Go Gurt April 11, 2011
 
2.
1. (informal.) diet coke
2. an unnaturally small penis, usually found only on midgets.
1. hey DaNaGe gemme a diet cockage (see -age, gemme)
2. wow that guy has a diet cock ! (ill remember that next time im trying to lose weight.)
by gen October 06, 2003