Definitions from Wiktionary (cockblock)

▸ verb:  (vulgar, slang, originally African-American Vernacular) To make or attempt to make another's intended goal of romantic relationship or sexual intercourse impossible.
▸ verb:  (by extension) To prevent someone from achieving a goal, aggressively getting in the way (e.g., an intentionally difficult level of a video game).
▸ noun:  (vulgar, slang) The act of cockblocking.
▸ noun:  (vulgar, slang) A person who cockblocks.

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