The art of drinking 2 pints of Guiness before you start a drinking session, and a further 2 pints of Guiness after - Resulting in the most spectacular toilet show the morning after.
"I'll give you £10 if you do a Guiness Sandwich tonight and mess up your Grandmother's toilet in the morning"
by JayxMagyar January 7, 2010
Get the Guiness Sandwichmug.