Message for low pair limits cryptic

I tried a Fir> Woo transfer with purposely low limits.
Set qty too low, the response was greying out of the Swap button, which is fine.
I removed a decimal point under the destination Woo until the swap re-appeared. trade value was Fir .0005 Woo .002
When I chose swap it responded with a message. Transaction failed "Slippage too low"
I started over and observed.
entering the Fir amount of .0005 created a woo amount of .0017 and trade completed.
Starting over.
Entering a woo amount of .002 created a Fir amount of .0005 and the trade failed with the slippage warning.
Seems to be an issue in accuracy when selecting the destination quantity instead of source quantity. (Sometimes people want to buy 100 of something, not $100 tokens worth of something)
Side comment:
Slippage is a geeky crypto term, normal people wont understand. "Adjust it", is also a little vague,

perhaps something like
"calculation between trade pair outside of range. Adjust source or destination amount and try again"