A woman's vagina that is that big you are able to hide inside it. Similar to a Trojan horse but pussy form. A Trojan pussy is an undesirable asset on a woman. Trojan pussys are most commonly found on fat woman and usually omit a foul odour.
I was shagging this girl and she had a Trojan Pussy, it was touch the sides and win a prize big!
Damn bitch that's a trojan pussy!