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1.
A polite way of calling someone a son of a bitch, but more harsh than son of a gun. Best used in mixed company where a real swear might not be appropriate.
"That George Bush sure is a son of a smichigun"
"Son of a smichigun, gas is expensive"
"That dutch bag son of a smichigun cut me off"
by Michael & Simone May 06, 2008