Really easily.

Usually in the sense of buying a bluff, lie, etc. someone buying something "Like discount fish" means they bought it almost instantly, without a second thought or any sort of analysis.

The term references the fact that due to its high price, people will often buy discount fish almost instantly without any consideration of its quality or why it's on discount.
Dandyman: I may or may not have of lied to the local policía that in return for your capture, I would

give them immortality.

Alucard: And they fuckin' bought that?

Dandyman: Like discount fish.

Alucard: You cheeky dick-waffle!
by Dusk Ealain April 3, 2017
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