A self (cock block) is when you are in a sexual situation but your nervousness prevents you from gaining an erection.
Todd: You hook up with that chick we met at that concert yet?
Kyle: I was gonna but I was self cock blocked cause she was (a score)
That nigga from the trap house. 1992 Trapper of The Year.
I got the 1992 Trapper of The Year card!
Who? That nigga Fats The Block?
A situation in the board game Puerto Rico, when during the Captain Phase of the game, a player opts to ship his goods in such a way as to prevent another player from having access to one of the three allotted ships.
John: "I could ship my tobacco on the ship already containing tobacco, but instead I choose to place my one corn on the large ship so that you can't get any points."
Mary: "Oh man, you are such a dock block!"