You guys want to give some explaination?

twee? is a new one to me.. I guess its something like frou-frou.. since its being paired with saccharine, or frilly.

where did it come from?

and it is used in UK or Canada? or is it a south of tropic of cancer speciality?
(and winsome to me would be coy and endearing.. a winsome gal might well be able to have her fellows wrapped around her finger and be able to persuad them to to anything.. but not persuasive.)