big Dick
noun
1
in craps, a roll of ten. Often embellished to 'big Dick from Boston', 'big Dick from Battle Creek', and 'big Dick the ladies' friend'. Gambling slang authority, the late Thomas Clark, theorised that 'dick' came from the French dix. Another popular folk etymology is that the original Big Dick was Boston dice cheater Richard Mantell who was shot to death as he switched dice while trying to shoot a ten. The addition of 'the ladies' friend' leaves little doubt as to the most probable etymology – ten inches would indeed be big US, 1904.
2
a 14-inch rocket US, 1946