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!