Thank you .sigma, very helpful. I thought it meant asymmetrical by being short upside skew.
I'd like to add that although a symmetrical natural fly (+1/-2/+1) has risk on both the upside and downside, there's a distinction one should be aware of.
Example: 105/110/115 call fly. If spot closes below 105, the entire call fly will expire worthless, obliterating your debit. But if spot closes above 115, you potentially have assignment risk, which is why its prudent to manage butterflies. So while yes theres risk on both sides, theres a different type of risk on the upside compared to the downside.
Hope this helps.