noun

• (software engineering) A mockup or prototype; particularly, ellipsis of mock object, as used in unit testing.
  "You can, if you must, create a mock that derives from a concrete class. The problem is that the resulting class represents a mix of production and mocked behavior, a beast referred to as a partial mock."

verb

• (rare) To create an artistic representation of.
  "[I]ts sculptor well those passions read / Which yet survive, stamped on these lifeless things, / The hand that mocked them and the heart that fed: […]"
• (software engineering, transitive) To create a mockup or prototype of.
  "They can also mock other integration points such as backend, database, or any other external resource."