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If someone is standing this way, what should be used:
Don't stand with your feets out.
Don't stand with your feets angled out
Don't stand with your feet sticking outward
Don't stand with your feet pointing outward.
Source:http://posturedirect.com/how-to-fix-duck-feet-posture/
It's often called being duck-footed or splay-footed...
As children grow, parents are often concerned about their feet pointing inwards when they walk (also called in-toe or pigeon-toed walking) or outwards (also called out-toe walking or duck-footed).
Note that splay-footed is also used to mean that the toes are more "spread out", not necessarily that the feet themselves point more "outwards".
The walking gait of someone whose feet turn outwards is also likely to be referred to as waddling (typically used specifically of how ducks themselves walk), but that term can also refer to the way a bow-legged person walks (stereotypically, an old-time cowboy who's spent too many years sitting in a saddle, forcing his legs apart).
Well, firstly the plural of foot is feet. No 's'.
The nearest of those to unambiguously mean what you want is the fourth. The first (ignoring the obvious error) could mean a number of things in different contexts. The second, ignoring the same error, might be very likely to result in people understanding you, but it doesn't sound like anything someone would say. The third is jarringly close to "your feet sticking out", which means something else.
I googled some and found the adjective duck-footed:
Duck-footed: Having splayfoot; habitually standing or walking with the ends of the feet angled outward
Wikipedia provides the following example of usage: "Texas Southern's Jim Hines, 20, is not the least bit pigeon-toed—in fact, he's just a little duck-footed, and it may be a good thing."
I don't know how to use this adjective in "Don't stand ___" though.
Definition of slue-foot [or -footed] as in "Slue-foot Sue" who was Pecos Bill's 1st wife... : having big, clumsy, or turned-out feet, sometimes spelled slew (nautical) Best wishes, Al
