Did you check the oil level?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

I'd guess that if it wasn't squirting anything it wasn't hurting
anything.    If it *was* squirting, you'd be leaving a slug trail down
the street and would run the engine dry pretty soon.

Being human, we sometimes forget to tighten things, or even to put
them back in at all.    That's why, before calling it a job well done,
you're always supposed to fire up the engine, give it a few seconds
for the oil pressure gauge to come up or the idiot light to go out,
and then, under suitably safe circumstances, LOOK at the filter and
its vicinity while the engine is still running.

So, as others have suggested, check the dipstick and look for signs of
spraying or spurting in the vicinity of the filter.  If the outside of
the engine is real wet or the inside is real dry, this changes from a
mechanical to a consumer issue.

How loose was loose?  As a general rule, perhaps with individual
exceptions, spin-on oil filters are to be hand-tightened maybe
three-quarters to one rotation after the base comes in contact with
the mounting surface.  You're not supposed to put a wrench on them and
really torque 'em down hard, though some people do, and I always seem
to be the next guy who tries to get the thing off.

Finally, what is the noise like?  Big or little?  Bottom end or top
end?  Thunky or rattly?  It could be indicative of insufficient oil,
or damage from insufficient oil pressure, or just a bit of valve
clatter...

--Joe