The term is derived from the Season 3 premiere of LOST, where an incarcerated Saywer spends most of the episode solving an elaborate puzzle only to be rewarded with a fish-shaped biscuit.
I worked 75 hours a week for 3 months to win the proposal and my boss gives me a $15 gift card to Wicks 'n Sticks? What a fish biscuit.
Also the same term was randomly shouted out by a certain individual who is obsessed with Lost, and also mentioned in an online conversation. Very possibly full of Omega-3.
"I figured out your complicated gizmos."
"Only took the bears two hours!"
"How many bears were there?"
(As quoted by a certain D-T-D)
"But sir, isnt that causing brain damage?"
"Nonsense! This is low in calories, we'll sell billions and become MULTI-MILLIONAIRES! Not to mention the added fish genomes for extra flavour we added into it, BWAHAHA!"
"erm...nothing. Continue slaving! BWHAHAHA!!"