A very versatile word, nibblet has a variety of meanings. Nibblet can mean piece of shit when referring to a person. It can be used affectionately between friends as a term of endearment. It can also be conveniently used as a verb (i.e. "nibbletize").
Joe: Let's go to the mall
John: Shut up, you fucking nibblet.
Sarah: What's up, you nibblet?
Amanda: Not too much, how about you?
Zach: You nibbletizing piece of shit.
Craig: Fuck you, you nibblet-hole!
Wife: Love you, nibblet!
Husband: Don't nibble too hard today, honey!