A concoction of alcoholic beverages transferred into an empty 2L bottle of some sort and shared amongst a group of people leaving a house "gaff" party en route to a nightclub.

The name originates from North County Dublin, the bottle resembles a house phone, & everyone always wants to use the gaff phone!
Who wants to use the gaff phone?

Giz a shot of the gaff phone?

Who's next on the gaff phone?
by MalletMan December 13, 2016
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