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1.
A very serious and legally binding pact between two or more parties in which blood from each party is placed onto the bottom of the pact next to the signature of each of the parties involved. Amendments to the pact cannot happen without the presence of all former parties present.
"Insert Quote from Blood Pact Night here"

We all have to fart on the blood pact...
by Dustin Ensign April 29, 2008
 
2.
A warrior cult of Chaos in the WarHammer 40,000 universe. They were primarily active during the Sabbat Worlds Crusade in retaliation against the Imperium of Man sometime in M41.750 to M41.820. Modeled on the lines of the Imperial Guard, and often made up of deserters from the Imperium, they were dedicated to the Blood God Khorne and were unhesitatingly loyal to their master, Archon Urlock Gaur.

Every soldier in this highly disciplined Chaos army personally swore allegiance to Gaur by slashing his palms on the jagged edges of the Archon's armour, hence the name "Blood Pact", since it was quite literally, a very intimate oath sworn in Blood.

Well trained, drilled and unflinching, and equipped with looted Imperial weapons or warped weapons produced on captured Forgeworlds, this army caused severe problems to the Imperial Crusade in the system, and was responsible for spawning many similar outfits in the Chaos armies modeled upon it, most notably the Sons of Sek.

They appear notably in the works of Dan Abnett, the famous novelist and author of the "Gaunt's Ghosts" series of books set in the WarHammer 40,000 universe, dealing with the exploits of the Tanith 1st and Only and their commanding officer, Colonel-Commissar Ibram Gaunt.
We are the Blood Pact, we are legion, and we swear our loyalty to the God of Rage, Blood and Fury, most glorious Khorne, and to his trusted arm and scourge, our Archon Urlock Gaur. May we scourge the false Emperor's lackeys from the stars, for the glory of Khorne and the glory of the Archon!
by Logical Fellow July 14, 2014
 
3.
1. A group of the coolest Alkaline Trio fan ever.
1. The Blood Pact is awesome!
by Xtheonex86 January 28, 2006