Hella can mean a few things, as a popular and very regional Northern California term for "very" or "lots of".
Hella the Band
Hella the SI Prefix
UCD physics student Austin Sendek is pushing for Hella to be adopted in the same way kilo or mega are standardized prefixes. He's seeing an ISO standard of 1027, which would follow zetta (1021) and yotta (1024).
Written out, it would be 1,000,000,000,000,000,000,000,000,000, which is a hella zeros.
- SacBee article, 2010-03-02