Sink Water Baptist
A person who in a bar is drunk and and is in need of water so they go to the bathroom and drink from the faucet.
there goes the sink water baptist! he think he slick!
Sink Water
Water that comes from the tap or is otherwise intended to be used for washing dishes and then disposed of through the drain. Generally not filtered or used for the purpose of drinking.
Rachael doesn’t drink “sink water” because she says it is not meant for drinking but rather washing dishes.