Nothing, Zero, Nada... Used almostly when bragging about not paying for a service or something.
It can also be used as an insult for saying someone is broke.
eg 1. I no get shishi for my phone but MTN allow me make call.
eg 2. Emeka no get shishi for pocket.
When you or someone have been trying to get something or achieve something for a long time but keeps failing
Guy, I dey try obtain U.S. visa but it just dey klop
["Failing", " difficult"]
Origin: From Jurgen klopp, Liverpool's manager