When a farmer blocks another farmer from harvesting or planting his/her crops on Farmville. This is usually used when a farmer's crops are about to wither.
Farmer 1: "Yo I planted some pumpkins about 11 hours ago and i need to harvest real quick"
Farmer 2:"Sorry man I'm actually harvesting and planting right now."
Farmer 1: "You're the biggest crop block ever. I'm never sending you free gifts."
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