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1.
Verb;Adjective. When you're so drunk/high that everything appears to be in slow motion. This can be a very fun experience.
Tom: "Hey Fred, how drunk were you last night?"

Fred: "I don't even know man, I got real Slothy!"
by D. Lux February 17, 2012
 
2.
When one is so inebriated from drinking copious amounts of alcohol that they stumble around like a sloth, very slow and calm like.
Yo, Peter...I heard you got mad slothy last night with that girlfriend of yours.
by Pie You October 12, 2009
 
3.
someone or something that is hot/beautiful or cool
Those girls are so slothy
by quinnnz November 22, 2005