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When a gay man, after being pounded in the ass, goes to take a shit and is unable to do it. He strugles really hard for a few hours and eventually shits out a premature baby.
"Todd just had a terd baby!"
by G-sauce May 15, 2003
the spawn resulting from unprotected anal-sex. coined by Adam Corolla on Loveline back in the day.
Q: "can i get my girl pregnant from anal sex"
A: "have you ever heard of a terd baby?"
"Elton John Jr. is a terd baby for sure" - me
by StiZOne April 08, 2003