Technically a mix of the words "swift" and "crafty", but you know what kind of definition you want to make of it. :]
"Daaayuum shawty you so swafty!"
A feeling of being hung over,
No known cure has been discovered, coz no-one was looking into it.
I got so smashed last night, I'm feeling a little swafty now. Wait, why are my pants on back-to-front?