1.A lesbian booty call that is not from a prostitute.
2.The woman who is called to perform it.
"There's no tallent tonight and i'm randy as a a mother fucker. I'll just call my fuckpie"
It could be an insult, it could be an expression to express anger. Who knows?
"You stupid fuckpie"
"GOD DAMN MOTHER FUCKING FUCKPIE"