Guy 2: He went to the hospital
Guy 1: Wankers cramp?
Guy 1: Your gay
Guy 2: You have wankers cramp
To wank is slang for masturbating, usually understood to be carried out on a man by someone of either sex.
Wanker's cramp is laughingly used to describe any hand pain, with the understood meaning that the person with the pain often masturbates.