Nibble v. t. : To bite by little at a time; to seize gently with the mouth; to eat slowly or in small bits.

Nibble v. t. : To bite upon something gently or cautiously; to eat a little of a thing, as by taking small bits cautiously; as, fishes nibble at the bait.

Nibble n. : A small or cautious bite.

Example:
What does it mean when kitties Nibble your fingers?

Taxonomy
nibble, byte, free encyclopedia, nybble, byte values, hexadecimal digits, bite, store, bit byte, readable, spelling, digit, debugging, Symbol, disk drive control, search, information storage, storage unit.

Defination from the web:
nibble is often called a "semioctet" or a "quartet" in a networking or telecommunication context. ... The term "nibble" originates from the fact that the term "byte" is a homophone of the English word "bite". A nibble is a small bite, which in this context is construed as "half a bite" ...