grog

1. spirits (originally rum) mixed with water.
2. crushed unglazed pottery or brick used as an additive in plaster or clay.

1. drink alcohol, especially to excess.

   he's been seen grogging up at McIntyre's

mid 18th century: said to be from Old Grog, the reputed nickname (because of his grogram cloak) of Admiral Vernon (1684–1757), who in 1740 first ordered diluted (instead of neat) rum to be served out to sailors.