When you don't use the Internet for at least 3 days.
A: Where's C?
B:He's at the internet cafe since 4:00.
A:What happened to him?
B:C suffered Internet Starvation for 1 whole month.
A: :(
To be so surprised/astonished/amazed/intense that your cock is knocked off.
That tentacle porn will knock your cock off.