When you accidently press the send button before you've finished typing the full message. Can occur while texting or email.
Guy 1: "Oh, man I just texted my girlfiiend that "I'd love to have a b"

Guy 2: "What?"

Guy 1: "Yeah, I didn't get to finish the sentence cause I accidently had a premature ejacusend. I was going to tell her I'd love to have a beer with her. "
by jlowe1964 January 19, 2010
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