Somebody who is a complete retard, normaly said when someone ither does something stupid or just to put them down if u think it wud be funny. It originates from people who are too dumb to go get a knife so instead jab at there food with a spoon. Basically a similar word would be retard.
Improbable natural impregnation because:
1. A woman is grossly unattractive.
2. A man is so unattractive/ineffectual/impotent that he could in no way father a child claimed to be his.
3.A woman's promiscuity brings paternity into doubt.
1. Jesus, man, she's so ugly I wouldn't breed with her even if it was a spoon job.
2. Yeah right, it's his! Must have been a spoon job.
3. She'd have more chance of knowing who the father is if it were a spoon job.