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That brown british sauce you always find in low class diners, but noone really eats it on anything.
Bob: Man, this HP sauce is the SHIT!

Jeff: Wrong bottle, thats MY shit.
by bmw295 September 05, 2008
Term given for a house party.
"I enjoyed that HP Sauce last night, it was pretty messy"
by Jojo-super-Jo March 26, 2010