What is Tangent Bell?
1.
A notional bell that is rung when a discussion has deviated from the intended point, or any useful tributary.
"Alrighty, I'm ringing the Tangent Bell, Heath Ledger's untimely demise has almost no relevance your annual performance review."
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7.
(v.i.) Out to lunch; not having it together; acting in a stupid way. Typically derogatory.
Derivation: ..