1.
n. - Has a variety of meanings and can be used in almost any context, much like the word fuck. It has been known to mean any and all of the following: idiot, dumbass, smartass, jackass, dick, pussy, asshole, bitch, moron, geek, dweeb, dork, twerp, fucker, fool, twit, nitwit, ignoramus, fucking up, fucking around, fucked. It can be used to address any type of person: your wife, your friends, your mom, dad, brother, sister, or grandparents, your boss, the guy who rear-ended you in the parking lot, the skinny guy at the gym that thinks he's big, the guy at the bar that can't stand up straight while pissing, and the guy who made up the word spratz.
To your wife/girlfriend: "Hey spratz!, get me a beer"
To your cousin after he stalled his boat on the lake while you're standing on shore: "Just paddle it in you spratz!"
See fucker, asshole, bitch, idiot, smartass
2.
A word used instead of mate, buddy, friend etc
eg: Hey spratz, how about a beer
Hey spratz, hows it going
See spratz, mate, buddy, friend, champ