cockblock

Meanings

1. To make or attempt to make another's intended goal of romantic relationship or sexual intercourse impossible.
2. To prevent someone from achieving a goal, aggressively getting in the way (e.g., an intentionally difficult level of a video game).

1. The act of cockblocking.
2. A person who cockblocks.

Etymology

Rhyming compound of cock + block; likely a back-formation from cockblocker. First use appears c. 1972. See cite below.