a term used to describe someone who is hooked in and believing it. Mostly used when someone is picking up chicks with some crappy pickup line (ex: is there a mirror in your pocket? cause i can see myself in your pants) and having the girl believe it.
"hey look, max is trying to pick up jacky with that lame pickupline. what a douche."
"i wouldnt say that looks like hes got hook line and sinker."
"oh........ god dammit......."