A common location of semen or ejaculation. Possibly:
a man in jail
God Damn, that whore is such a Ejacshack.
Yo man, Jamal was tight shit till he went to jail. .Now that nigga just an Ejacshack.
Garret: Dude, I couldn't find anywhere to blow my load , so I just chose the sink.
Tom: Damn man, I normally just use tissues as my ejacshack.