Means without much effort. If it relates to "can't be arsed," then I suppose it's worse than fully-assed. If not, I'm not sure.
Interesting, here "half-arsed" usually means "did not try very hard" or "could have done better", as in "a half-arsed effort".
done with little effort or care; incompetent or inadequate.
"a half-arsed attempt to rectify the problem"
HANG ON, RETHINK TIME,
I may have read your words as meaning "easily done", O Asmo.