Diabetical

[Jessica]

Pertaining to diabetes; as, diabetic or diabetical
treatment.

[Mark Zuckerberg]

Saying, Aww dude, thats sweet! is totally inappropriate and downright douchebaggary when describing something sweeter-than-sweet thus, use diabetical, so that it is clear how sweet and potentially dangerous the subject is...
So sweet it may give you diabetes, the subjects diabolical plan...