Guinnessing 

The act of ejaculating on a females head to make her look like a pint of Guinness

Barrington - Oi fam did you smash that Irish ting last night?
Ramraj - Yeh bruhh, I gave her a proper Guinnessing
Barrington - A what?! :/
Ramraj - You don't know shit!

Guinnessing by Assfinger9000 November 22, 2016

Guinnesswine 

Guinnesswine is the nectar of the gods. Able to give any mortal human the power to achieve anything they so wish

Ah mate I’m so close to the summit of Everest, best drink some Guinnesswine so I can get there

Guinnesswine by MasterEvski November 8, 2019