When someone goes off (often inappropriately) on a tangent about Blackpool FC and completely destroys the conversation.
Grown from tangentacide
Also used to highlight any other football related tangentacide
Person A: "I was watching the night sky with Patrick Morre last night and he said the sun"
Obnoxious Blackpool Fan/Person B: "is tangerine in places. Did I mention we beat Liverpool at Anfield!"
- Conversation Dies Completely
Person C: "That's Tangerinacide that"