To be pregnant, often unplanned. Synonm to up the duff or opps-a-daisy
Check out that whale, she must be insperminated
by captain Obvious1234567 February 20, 2010
1 more definition
The act of a man ejaculating into a womans vagina.
He insperminated me the first time we hooked up.
by Lizann January 30, 2008