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1.
The Holy Grail is when you take the scrotum and pull it down in a pocket making it into a cup. Then filling it with a liquid and drinking from it.
Dude1: Dude My girlfriend did The Holy Grail. She drank strawberry milk from my nut sack.
Dude 2: Man I wish my girlfriend would do that. But shes lactose intollerant.
by Magic Monkey and CKerrLA July 07, 2012
 
2.
The Holy Grail is a term used by porn stars, can be used as a noun, verb and/or adjective, and is basically when a female porn star takes a cock in her arse, a cock in her vagina and a cock in her mouth, all whilst simultanously giving two handjobs.

In my experience, The Holy Grail is a trick best left for the pros.
"Have you seen 'Bangin from behind 25' yet? It's the one where Rachel Lurid achieves the Holy Grail!"
by Courtney April 06, 2005
 
3.
A very threatening cup holding a can of 'peer' held by very buzzing people spilt in to a chavs hat.
'hahahahhahahahaha remember on new years when we spilt the holy grail in to - insert secret identity here - 's hat.'
'OMG was he okay with that!?!?'
'huh?'
'well.. chavs are very protective of their hats... wow he really must have wanted to shag one of you..'
by anemiaaimena March 27, 2010
 
4.
The Holy Grail is the tomb of Mary Magdalene and the Sangreal documents, which prove that she was Jesus Christ's wife and that he was a father.
This theory is discussed in the books Holy Blood, Holy Grail and The Da Vinci Code.
The Holy Grail is not a cup, but rather a metaphor for something much more important.
by Malorie April 09, 2006