Dorothy Parker called her parrot Onan because it spilled its seed on the ground.
I found that Quite Interesting, I didn't know it. (At first I thought I must have missed that episode, until I realised I was watching Bonus Bits & Bloopers on YouTube.) Let's take a look at the King James Bible:
And Judah said unto Onan, Go in unto thy brother's wife, and marry her, and raise up seed to thy brother.
And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother.
And the thing which he did displeased the LORD: wherefore he slew him also.
(This links to a different translation than the one quoted above, try out other versions by using the pull-down menu.)
Which sounds to me that someone was pissed off at Onan for not impregnating his brother's wife, rather than for masturbating...
In fact doesn't it sound as if he pulled out? In Dutch we call that "leaving the church without singing".