2. That pig at the fair was hellaciously ginormous. (Doubled-up)
3. Dude, that's a hellacious amount of "oregano" you have there.
2. an extremely unpleasant thing
3. something that annoyed you because it took too long
4. a way to describe anything that didn't go your way
2. That was a hellacious thing.
3. That wait for a sno-cone was hellacious
4. Today was a hellacious day at work.