Someone who lives near a bog
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Mentally competent - e.g. "He's not the full shilling"
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A woman with a particularly sloppy Vagina

"Hi Fellas, the cocktrough on that thing was like ploughing a field with a pencil."

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Stupid

e.g. "that fella there is as thick as 2 short planks!"

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na, keep it
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a reference to a man ejaculating over a womans face
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Mouth - "He never shuts his gob"