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1. Spess
From the term "Specimen" - A Weirdo that does weird shit for no reason other the the fact they are a complete lab specimen!
Oh my god, look at that spess With the long blonde mullet and 1980's bomber jacket! What a fuckin' spess!
2. spess
More commonly referencing a guy who is extremely muscular and or does something that is very aggressive.
However, anyone can be a spess. Could be something as meaningless as a guy drinking a beer in public in broad daylight.
Also can be someone who just clearly has no regard for anyone else, any law, or anything in general.

Synonyms: Jacked, Ripped, dilligaf, doesnt give a fuck
Antonyms: Weak, scrawny
"Look at that spess".
"That guys a fuckin spess".
(After a guy on cops punches another guy in the face) "what a spess"
"Only spess's ride motorcycles with their shirts off"
"What a spess move"
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