A phrase used when someone offers you useless or moronic advice, which will be immediately disregarded but you do not want to offend them, sparing their weak minds.
Them: Hey maybe you should join the Army. You know that its a great way to see the world. You will become more of an individual and nowadays they can place you in jobs that won't involve you having your limbs blown off or your face looking like Freddy Krueger's.
Basically stemming from, "take that cookie" or "take you're cookie", if someone tells you this, it is like saying, "keep that seat warm for me" but they want you to keep your ass ready for them so when they tryna take it, its nice and soft.
Guy: Keep wearin that miniskirt and its whatever you want it to be.
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One family guy episode.
Guy 1: *whips bruce from family guy* Whats your name?!
Bruce: Honey you keep that whippin up and its whatever you want it to be.