Giving something to employees that comes at an inconsequential cost to the company; an incentive. Used in the Simpsons when Homer requests more tartar sauce for employees to use on their fish sticks. This theoretically results in better employee moral and, thus, greater productivity.
"Those donuts I put in the break room are pure tartar sauce."
When a girl gives you a salmon helmet (sits on your face with a dirty dirty vagina) that is extra foul, the tartar sauce is the green/thick/nasty stuff in her vagina.
That nasty ho gave me a salmon helmet last night with extra tartar sauce. I had to clear my throat afterwards and wipe my face off with a towel.