depth charge
noun
1
a shot of whisky served in a glass of beer US, 1956.
2
a fig or a prune. Of Royal Navy and Royal Air Force origins; comparing an explosion in the deep, which is in the power of such military hardware, to the laxative effect of the fruits UK, 1943.
3
any food that is heavy or stodgy, such as dumplings. From the effects on your lower depths; originally recorded in prison use but soon in wider use UK, 1950