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A Half Metric Dozen is defined as either 5 or 6 depending on the situation.

To Circle logic yourself into a hole.
A- I want a cigarette.
B- You just had one.
A- No I didn’t, I had half a cigarette before, put it out then had the second half just now.
B- So you just had a cigarette.
A- No I just had half a cigarette, and another half before… wait a second… I just metric dozened myself there didn’t I?
by Myke April 15, 2004
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