Sucking eggs

[JustinP]

Where did the phrase 'teaching grandma to suck eggs' originate?

[Quizmonster]

Click http://www.worldwidewords.org/qa/qa-tea1.htm for the answer.

[xyzzyplugh]

one thing wrong with the above explanation; You don't suck eggs, you blow them. Maybe this is where the confusion arose with blow job. Shouldn't it be a suck job?