Gerna is a sentance
filler/enhancer used in Northern
California dialect, specifically Humboldt County.
Sometimes used at as a substitute adjective like "shitty" or "crappy". The higher excitement level, the more frequently the word appears in a sentance.
Moderately excited usage: "That
darn gerna
cell site ain't gerna no good."
Highly excited usage: "Gerna darn gerna gerna
cell gerna site gerna ain't gerna no gerna good."