1. To be used as an expression of excitement or exclamation.
2. When one is severely angry or disappointed in a particular outcome.
3. When one wishes to initiate an exciting adventure.
The meaning of the word is defined by the connotations of tone.
2. Why did Ramirez not pass the ball? Dicks Ahoy!
3. Gordon, load up the packhorses, we are going to Mansfield! Dicks Ahoy!