Someone who is shaped like a goat or is incredibly awesome. Or both. Both is good.
-"gOlLy JeE, BrAd SuRe Is GoAtLy"
-"InDeEd, BrOtHeR, hE iS bOtH sHaPeD lIkE a GoAt AnD hE iS aWeSoMe."
Someone who is goat like.
Maybe dons a rather stylish beard quite similar to the billy goats gruff.
"look at him!"
"wow! His beard is amazing!"
" yeah he's proper GOATLY"
"I could hit that"
"That's a baaaaaaad"