1 definition by Ebster101

A natural reaction to hearing nonsense or bullshit.

Sounds like "up" or "oup" (best is said fluently quick)
Jake: "The Earth is flat..."

**One would react** "Oap"

Matt: "Epstein didn't kill him self"

**One would respond** "Thats forsure"
by Ebster101 December 16, 2019
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