A boy that was a result of artifical insemination but was born to the partner of a sibling.
Coined by William from "Girlfriends" to explain that his sister's son was born to her girlfriend who was inseminated by William. Usually comes up when William has to shop or participate in some activity. i.e., "I went to the park with my nephew son."
by Liz Kupcha October 02, 2008