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1) A derogatory for a suspected slut.

2) Term coined for Gwen Stefani by the Character Clevand on "Family Guy" Season 7 Ep. 15
1) Guy 1: "Dude, your last girlfriend was such a slut, she even tried to make out with me."
Guy 2: "Yeah, she was a fishdog."

2) "To this day, I have no idea what that woman was singing about - like literally, no idea. I don't know what a 'Holla Back Girl' is, but I have to imagine it's a foul, diseased-ridden thing that wears too much make-up to cover up the fact that it's a 47 year old fishdog." - Cleveland, from Family Guy
fishdog by Mr.RockYourWorld January 4, 2011

fort lewis fishhook

When your fuckin a girl from behind and stick your finger in here ass then hook it in here mouth
Army guy:Hey I just gave this air force chick a mean fort Lewis fishhook

the rusty fishhook 

When performing the act of sex while in the doggy style position and entering vaginally, use your index finger to slide in and out of her brown eye. If you realize your finger is becoming engulfed in matter of a brown nature, swing your finger up to her mouth and hook her like a fish.
Billy: I was tapping Tammy from behind and doing that thing she loves with my finger in her ass, but then I realized my finger was covered in shit.

Jim: That's fucked up. What did you do?

Billy The Rusty Fishhook.

Jim: God damn right.

Fishhook 

While behind someone inserting your index finger into thier mouth and pulling back towards the back of thier head therefore catching them like a fish on a hook. The sexual refrences above are foreign to me. To my knowledge no one has ever caught a fish with a hook to the ass.
Amongst other things the fishhook is illegal in the U.F.C. because it is so brutally painfull.

I gave Kano a fishhook so hard it ripped the corner of his mouth.
Fishhook by Lancelot87 May 12, 2006

Rusty Fishhook 

Similar to the shocker, but afterwards the poo-laden finger is inserted to the womans or mans(in prison) mouth in a hooked fashion.
Susan knew what her ass tasted like after I gave her a rusty fishhook.
Rusty Fishhook by Anonymous May 8, 2003

fishhook 

A variation of the shocker in which you pull back towards the pussy after you stick your finger up her anus.
Damn, that freak ass bitch loves it when I fishhook her!
fishhook by Bud E Love May 2, 2003