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!
Pissing in the sink instead of the toilet. An act which saves water and is therefore good for the planet but enrages women purely because they can't do it due to their defective chromosomes, causing them to make ridiculous claims such as "it's disgusting" when we all know that urine is sterile as it leaves the body.
A sarcastic variation of the phrase whatever floats your boat. Used in place of 'whatever floats your boat' when someone's preferences are harmful or you simply disagree with them.