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1.
A phrase stated after something/someone has been easily fooled or lured in. It has its roots in fishing lingo, referring to a fish having fallen for the bait easily; swallowing the hook, the fishing line, and the sinker along with it.
I jus' put out a sign this mornin' readin', 'BABY HOGGS 4 SALE CHEEP. CAWT WILD YESTIDDY'. Boy, I ain't neva' seen so many folks come runnin' to the ranch! Leetle did they know I breed them hawgs muhself. Tee hee! Hook, line and sinker! Haw haw!
by phurtive July 01, 2011
 
2.
Hook, Line and Sinker is an act of severe punishment for someone who has wronged you, or acted like a bitch in general. One or two people with restrain or "hook" the asshole. If you don't know what hook means, watch The Gangs of New York. You place index/middle fingers on the inside of someones cheek and force the mouth open, in agonizing pain. The line= pee and the sinker= poo.
Dude, Blake was being such a bitch today, Me, Tommy, Jon and Josh had to hook, line and sinker his ass. Bitch.
by OliverWilliams November 22, 2005
 
3.
During secks, a finger prods into and orifice and curls creating a hook, the tinky winky goes in along with the hook, at which point you positiin your partner over a body of water, sinking them in while you are.. uh in them
The way we fell made it look as if we were in the Hook, Line and Sinker position
by Drajak August 14, 2014