Guinness Bomb 

Consists of dropping a shot of Jagermeister into a pint of Guinness, the participant must then down the resulting 'Guinness Bomb' in one. Much like it's more popular cousin the Jager Bomb, but much more potent.

Did you see that Barry down a Guinness Bomb last night?

Guinness Bomb by barry billet street January 7, 2012

Guinness Man 

A Guinness Man is a man who predominantly drinks Guinness above all other pint options.

He will sometimes drink lager, but more often than not he'll go for a Guinness.

A Guinness Woman demonstrates the same traits as a Guinness Man, but she is female.

Man one: I'm heading to the bar, lager?

Man two: No thanks, I'm a Guinness Man.

Guinness Man by rormcgror October 10, 2013

Guinness World Record 

Drinking so much Guinness beer that you are hypothetically in the running for a world record.

Bob: Steve almost set a Guinness World Record last night at the pub.

Paul: For his really long fingernails?

Bob: No, he just drank shitloads of Guinness.

Guinness World Record by Pistol Pete Maravich July 9, 2011

Guinness Pig 

The Frat brat who hogs all the Guinness!

"Hey, save some for us, you Guinness Pig! What are you trying to do, set a Guinness Drinking Record?"

Guinness Pig by Mike Cox November 24, 2006

Guinness Eels 

The name given to live born young that result from a night of drinking alot of Guinness.

The young are often born in rivers and semi private places near bars and sailors.

Singular: Guiness eel if only one intact log is present.

"You lads down stream swimming, watch out! Guinness eels headed your way!"

Guinness Eels by LittleTed August 6, 2017

Guinness Monster 

This refers to your Fecal mass (Poo) the day after a Guinness bender which is black and quite scary and should be known as a guiness monster

"Dude I just unleashed a guinness monster all over the bowl"

Guinness Monster by Dave1892 April 27, 2006

Guinness Slump  

n.
Guin·ness Slump (gin'iss slump)

1. The state of being on such a long dry spell that it dares to compete for longest slump in history, ergo being submitted to the Guinness Book of World Records.

i.e. Your best excuse for sleeping with someone highly unattractive, but one that gets you made fun of nonetheless.

1.
Guy 1: Dude Lindsey is lookin' fine tonight man, why don't you jump on that shit? She'd so let you smash.
Guy 2: Dude, I don't even think I remember how to smash. I'm on a fuckin' Guinness Slump here...
Guy 1: LOL!

Guinness Slump by Sweettooth187 February 27, 2009