Mondo means "world class" in Italian and is best used as an adverb to amplify or emphasize adjectives or verbs, i.e. "that chick's butt is mondo juicy" or "I was mondo chillin' with Kelly last night" Simply using mondo to modify a noun i.e. "that's a mondo car" IS FUCKING LAME!!!
A mondo killer wave
That bitch is mondo gorgeous
Dude you were mondo snoring last night