Combination of the words Sick, Wicked, and Nasty. Swasty is a term used when in the presence of something amazing. Used because saying 1 of the 3 words is just not enough to express its magnitude.
"DAMN, did u see that dunk?! That was swasty!"
"That movie was too swasty!"
"That was possibly the most swasty thing I have ever seen."
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."