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When you get caught with your pants down and the lady smells like a rotting fish market, that’s a mackerel flap.
My man got a mackerel flap after sneaking into the office lunch room and trying to kiss the receptionist.
He went down on her and got hit with a mackerel flap. Now he smells like a fishmonger’s worst nightmare.
At the gym, he got a mackerel flap after trying to seduce the cleaning lady during her break.