words that irk me

Dartnut said

And there are a lot of people who use a swear word for every second word that comes out of their mouth.

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In construction, I have known guys that use and fuckin frequently. It sounds so ignorant.
Over here at this wall, you need to run a row of blocks and fuckin at 28 inches to center......and fuckin six feet and down for the cabinet mounts and fuckin A-34 brackets at all 4 corners.
WHAT does And fuckin add to the sentence ???