Meaning

noun a unit of information equal to 1024 mebibytes or 2^30 (1,073,741,824) bytes

noun a castrated tomcat

originUnknown (14th century). Perhaps abbreviated from Gilbert, the name of the cat in the medieval fables of Reynard the Fox, Romaunt of the Rose, and so on.

Etymology from Wiktionary, CC BY-SA 3.0