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!