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1.
A combination of Fuck and Sweet. I got tired of having to say fucking sweet so I combined them and arrived at "Fucksweet" Greatest conjunction ever.
"Dude, Metal Gear Solid 3 is FUCKSWEET!"
by Testas22 December 23, 2004
 
2.
Comes from old anglo-american roots of the terms "Fuck" and "Sweet"

When their powers combine, they create "Fucksweet" - used in many elevating circumstances
"that totally in the sauce radish is some fucksweet radish right there!"
by Lord Cuntingberry-Smythe November 10, 2004