Iencli (iencli) is the french back slang of "client", as in a consumer who buys
something or uses a service and pays for it.
More specifically, the term mockingly refers to naive and ingenuous
people who spend money on
useless things, worthless features or bad quality products without realising they are being fooled by the seller, who profits from their gullibility.
The word was popularized and is also most often used by drug dealers to designate their buyers.